640642113045 has 48 divisors (see below), whose sum is σ = 1264065409152. Its totient is φ = 297109380480.

The previous prime is 640642113037. The next prime is 640642113073. The reversal of 640642113045 is 540311246046.

640642113045 is a `hidden beast` number, since 6 + 4 + 0 + 642 + 1 + 1 + 3 + 0 + 4 + 5 = 666.

It is not a de Polignac number, because 640642113045 - 2³ = 640642113037 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 28123974 + ... + 28146743.

It is an arithmetic number, because the mean of its divisors is an integer number (26334696024).

Almost surely, 2^640642113045 is an apocalyptic number.

It is an amenable number.

640642113045 is a deficient number, since it is larger than the sum of its proper divisors (623423296107).

640642113045 is a wasteful number, since it uses less digits than its factorization.

640642113045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56270762 (or 56270759 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 36.

The spelling of 640642113045 in words is "six hundred forty billion, six hundred forty-two million, one hundred thirteen thousand, forty-five".