64547030681 has 4 divisors (see below), whose sum is σ = 73768035072. Its totient is φ = 55326026292.

The previous prime is 64547030677. The next prime is 64547030687. The reversal of 64547030681 is 18603074546.

64547030681 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.

It is a cyclic number.

It is not a de Polignac number, because 64547030681 - 2² = 64547030677 is a prime.

It is a super-2 number, since 2×64547030681² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64547030687) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4610502185 + ... + 4610502198.

It is an arithmetic number, because the mean of its divisors is an integer number (18442008768).

Almost surely, 2^64547030681 is an apocalyptic number.

It is an amenable number.

64547030681 is a deficient number, since it is larger than the sum of its proper divisors (9221004391).

64547030681 is an equidigital number, since it uses as much as digits as its factorization.

64547030681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9221004390.

The product of its (nonzero) digits is 483840, while the sum is 44.

It can be divided in two parts, 64 and 547030681, that added together give a palindrome (547030745).

The spelling of 64547030681 in words is "sixty-four billion, five hundred forty-seven million, thirty thousand, six hundred eighty-one".