64444436375657 has 16 divisors (see below), whose sum is σ = 70466185560960. Its totient is φ = 58576827792000.

The previous prime is 64444436375651. The next prime is 64444436375689. The reversal of 64444436375657 is 75657363444446.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64444436375657 is a prime.

It is a super-2 number, since 2×64444436375657² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64444436375651) 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, 42405719 + ... + 43899132.

It is an arithmetic number, because the mean of its divisors is an integer number (4404136597560).

Almost surely, 2^{64444436375657} is an apocalyptic number.

It is an amenable number.

64444436375657 is a deficient number, since it is larger than the sum of its proper divisors (6021749185303).

64444436375657 is a wasteful number, since it uses less digits than its factorization.

64444436375657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86305744.

The product of its digits is 2438553600, while the sum is 68.

The spelling of 64444436375657 in words is "sixty-four trillion, four hundred forty-four billion, four hundred thirty-six million, three hundred seventy-five thousand, six hundred fifty-seven".