64244162521 has 16 divisors (see below), whose sum is σ = 82858573440. Its totient is φ = 48334164480.

The previous prime is 64244162497. The next prime is 64244162551. The reversal of 64244162521 is 12526144246.

It is not a de Polignac number, because 64244162521 - 2⁷ = 64244162393 is a prime.

It is a super-2 number, since 2×64244162521² (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 (64244162551) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14382936 + ... + 14387401.

It is an arithmetic number, because the mean of its divisors is an integer number (5178660840).

Almost surely, 2^64244162521 is an apocalyptic number.

It is an amenable number.

64244162521 is a deficient number, since it is larger than the sum of its proper divisors (18614410919).

64244162521 is a wasteful number, since it uses less digits than its factorization.

64244162521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28770384.

The product of its digits is 92160, while the sum is 37.

The spelling of 64244162521 in words is "sixty-four billion, two hundred forty-four million, one hundred sixty-two thousand, five hundred twenty-one".