64431622641 has 8 divisors (see below), whose sum is σ = 85910776864. Its totient is φ = 42953441760.

The previous prime is 64431622637. The next prime is 64431622669. The reversal of 64431622641 is 14622613446.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 64431622641 - 2² = 64431622637 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 64431622641.

It is not an unprimeable number, because it can be changed into a prime (64431622691) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 71551 + ... + 366036.

It is an arithmetic number, because the mean of its divisors is an integer number (10738847108).

Almost surely, 2^64431622641 is an apocalyptic number.

It is an amenable number.

64431622641 is a deficient number, since it is larger than the sum of its proper divisors (21479154223).

64431622641 is a wasteful number, since it uses less digits than its factorization.

64431622641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 486671.

The product of its digits is 165888, while the sum is 39.

The spelling of 64431622641 in words is "sixty-four billion, four hundred thirty-one million, six hundred twenty-two thousand, six hundred forty-one".