64375133443681 has 4 divisors (see below), whose sum is σ = 64663811172352. Its totient is φ = 64086455715012.

The previous prime is 64375133443669. The next prime is 64375133443727. The reversal of 64375133443681 is 18634433157346.

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 a de Polignac number, because none of the positive numbers 2^k-64375133443681 is a prime.

It is a super-2 number, since 2×64375133443681² (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 (64375133444681) 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, 144338864001 + ... + 144338864446.

It is an arithmetic number, because the mean of its divisors is an integer number (16165952793088).

Almost surely, 2^{64375133443681} is an apocalyptic number.

It is an amenable number.

64375133443681 is a deficient number, since it is larger than the sum of its proper divisors (288677728671).

64375133443681 is a wasteful number, since it uses less digits than its factorization.

64375133443681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 288677728670.

The product of its digits is 52254720, while the sum is 58.

The spelling of 64375133443681 in words is "sixty-four trillion, three hundred seventy-five billion, one hundred thirty-three million, four hundred forty-three thousand, six hundred eighty-one".