264201916981 has 4 divisors (see below), whose sum is σ = 264220961472. Its totient is φ = 264182872492.

The previous prime is 264201916963. The next prime is 264201916997. The reversal of 264201916981 is 189619102462.

264201916981 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 189619102462 = 2 ⋅94809551231.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-264201916981 is a prime.

It is a super-2 number, since 2×264201916981² (a number of 24 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (264201916921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9501421 + ... + 9529186.

It is an arithmetic number, because the mean of its divisors is an integer number (66055240368).

Almost surely, 2^264201916981 is an apocalyptic number.

It is an amenable number.

264201916981 is a deficient number, since it is larger than the sum of its proper divisors (19044491).

264201916981 is a wasteful number, since it uses less digits than its factorization.

264201916981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19044490.

The product of its (nonzero) digits is 373248, while the sum is 49.

The spelling of 264201916981 in words is "two hundred sixty-four billion, two hundred one million, nine hundred sixteen thousand, nine hundred eighty-one".