64615264632642 has 128 divisors (see below), whose sum is σ = 144673348884480. Its totient is φ = 19197675604800.

The previous prime is 64615264632637. The next prime is 64615264632649. The reversal of 64615264632642 is 24623646251646.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is not an unprimeable number, because it can be changed into a prime (64615264632649) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 57179517 + ... + 58298607.

It is an arithmetic number, because the mean of its divisors is an integer number (1130260538160).

Almost surely, 2^{64615264632642} is an apocalyptic number.

64615264632642 is an abundant number, since it is smaller than the sum of its proper divisors (80058084251838).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

64615264632642 is a wasteful number, since it uses less digits than its factorization.

64615264632642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1119237 (or 1119199 counting only the distinct ones).

The product of its digits is 59719680, while the sum is 57.

The spelling of 64615264632642 in words is "sixty-four trillion, six hundred fifteen billion, two hundred sixty-four million, six hundred thirty-two thousand, six hundred forty-two".