640332942336 has 66 divisors (see below), whose sum is σ = 1848947501492. Its totient is φ = 213444311040.

The previous prime is 640332942331. The next prime is 640332942419. The reversal of 640332942336 is 633249233046.

640332942336 is a `hidden beast` number, since 6 + 403 + 3 + 2 + 9 + 4 + 233 + 6 = 666.

It is a super-2 number, since 2×640332942336² (a number of 24 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 640332942291 and 640332942300.

It is not an unprimeable number, because it can be changed into a prime (640332942331) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 34731070 + ... + 34749501.

Almost surely, 2^640332942336 is an apocalyptic number.

It is an amenable number.

640332942336 is an abundant number, since it is smaller than the sum of its proper divisors (1208614559156).

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

640332942336 is a wasteful number, since it uses less digits than its factorization.

640332942336 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69480597 (or 69480576 counting only the distinct ones).

The product of its (nonzero) digits is 1679616, while the sum is 45.

The spelling of 640332942336 in words is "six hundred forty billion, three hundred thirty-two million, nine hundred forty-two thousand, three hundred thirty-six".