640642155153 has 96 divisors (see below), whose sum is σ = 1194513610752. Its totient is φ = 300056400000.

The previous prime is 640642155133. The next prime is 640642155221. The reversal of 640642155153 is 351551246046.

It is not a de Polignac number, because 640642155153 - 2¹⁰ = 640642154129 is a prime.

It is not an unprimeable number, because it can be changed into a prime (640642155103) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 549528 + ... + 1258278.

It is an arithmetic number, because the mean of its divisors is an integer number (12442850112).

Almost surely, 2^640642155153 is an apocalyptic number.

It is an amenable number.

640642155153 is a deficient number, since it is larger than the sum of its proper divisors (553871455599).

640642155153 is a wasteful number, since it uses less digits than its factorization.

640642155153 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 708835 (or 708828 counting only the distinct ones).

The product of its (nonzero) digits is 432000, while the sum is 42.

The spelling of 640642155153 in words is "six hundred forty billion, six hundred forty-two million, one hundred fifty-five thousand, one hundred fifty-three".