640655434362 has 128 divisors (see below), whose sum is σ = 1383192889344. Its totient is φ = 197111236608.

The previous prime is 640655434357. The next prime is 640655434399. The reversal of 640655434362 is 263434556046.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 570485133 + ... + 570486255.

It is an arithmetic number, because the mean of its divisors is an integer number (10806194448).

Almost surely, 2^640655434362 is an apocalyptic number.

640655434362 is an abundant number, since it is smaller than the sum of its proper divisors (742537454982).

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

640655434362 is a wasteful number, since it uses less digits than its factorization.

640655434362 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1732.

The product of its (nonzero) digits is 6220800, while the sum is 48.

The spelling of 640655434362 in words is "six hundred forty billion, six hundred fifty-five million, four hundred thirty-four thousand, three hundred sixty-two".