64657455475646 has 32 divisors (see below), whose sum is σ = 107584489482336. Its totient is φ = 28895344848000.

The previous prime is 64657455475609. The next prime is 64657455475649.

64657455475646 is nontrivially palindromic in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64657455475649) 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, 7428665 + ... + 13583076.

It is an arithmetic number, because the mean of its divisors is an integer number (3362015296323).

Almost surely, 2^{64657455475646} is an apocalyptic number.

64657455475646 is a deficient number, since it is larger than the sum of its proper divisors (42927034006690).

64657455475646 is a wasteful number, since it uses less digits than its factorization.

64657455475646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21014108.

The product of its digits is 10160640000, while the sum is 74.

The spelling of 64657455475646 in words is "sixty-four trillion, six hundred fifty-seven billion, four hundred fifty-five million, four hundred seventy-five thousand, six hundred forty-six".