64378165205660 has 48 divisors (see below), whose sum is σ = 137150322924384. Its totient is φ = 25381104446208.

The previous prime is 64378165205617. The next prime is 64378165205681. The reversal of 64378165205660 is 6650256187346.

It is a self number, because there is not a number n which added to its sum of digits gives 64378165205660.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 75931859 + ... + 76775018.

It is an arithmetic number, because the mean of its divisors is an integer number (2857298394258).

Almost surely, 2^{64378165205660} is an apocalyptic number.

It is an amenable number.

64378165205660 is an abundant number, since it is smaller than the sum of its proper divisors (72772157718724).

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

64378165205660 is a wasteful number, since it uses less digits than its factorization.

64378165205660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152707190 (or 152707188 counting only the distinct ones).

The product of its (nonzero) digits is 43545600, while the sum is 59.

The spelling of 64378165205660 in words is "sixty-four trillion, three hundred seventy-eight billion, one hundred sixty-five million, two hundred five thousand, six hundred sixty".