264242755981 has 4 divisors (see below), whose sum is σ = 269228468412. Its totient is φ = 259257043552.

The previous prime is 264242755963. The next prime is 264242755991. The reversal of 264242755981 is 189557242462.

264242755981 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.

It can be written as a sum of positive squares in 2 ways, for example, as 224430535081 + 39812220900 = 473741^2 + 199530^2 .

It is a cyclic number.

It is not a de Polignac number, because 264242755981 - 2¹³ = 264242747789 is a prime.

It is a super-2 number, since 2×264242755981² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (264242755991) 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, 2492856136 + ... + 2492856241.

It is an arithmetic number, because the mean of its divisors is an integer number (67307117103).

Almost surely, 2^264242755981 is an apocalyptic number.

It is an amenable number.

264242755981 is a deficient number, since it is larger than the sum of its proper divisors (4985712431).

264242755981 is an equidigital number, since it uses as much as digits as its factorization.

264242755981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4985712430.

The product of its digits is 9676800, while the sum is 55.

The spelling of 264242755981 in words is "two hundred sixty-four billion, two hundred forty-two million, seven hundred fifty-five thousand, nine hundred eighty-one".