640655533352 has 16 divisors (see below), whose sum is σ = 1201325204160. Its totient is φ = 320302145584.

The previous prime is 640655533321. The next prime is 640655533363. The reversal of 640655533352 is 253335556046.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 640655533297 and 640655533306.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3096158 + ... + 3296589.

It is an arithmetic number, because the mean of its divisors is an integer number (75082825260).

Almost surely, 2^640655533352 is an apocalyptic number.

It is an amenable number.

640655533352 is a deficient number, since it is larger than the sum of its proper divisors (560669670808).

640655533352 is a wasteful number, since it uses less digits than its factorization.

640655533352 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6405280 (or 6405276 counting only the distinct ones).

The product of its (nonzero) digits is 4860000, while the sum is 47.

The spelling of 640655533352 in words is "six hundred forty billion, six hundred fifty-five million, five hundred thirty-three thousand, three hundred fifty-two".