640170317536 has 24 divisors (see below), whose sum is σ = 1275520080744. Its totient is φ = 316228709760.

The previous prime is 640170317519. The next prime is 640170317557. The reversal of 640170317536 is 635713071046.

640170317536 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×640170317536² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 640170317492 and 640170317501.

It is a congruent number.

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, 120511335 + ... + 120516646.

It is an arithmetic number, because the mean of its divisors is an integer number (53146670031).

Almost surely, 2^640170317536 is an apocalyptic number.

It is an amenable number.

640170317536 is a deficient number, since it is larger than the sum of its proper divisors (635349763208).

640170317536 is a wasteful number, since it uses less digits than its factorization.

640170317536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 241028074 (or 241028066 counting only the distinct ones).

The product of its (nonzero) digits is 317520, while the sum is 43.

The spelling of 640170317536 in words is "six hundred forty billion, one hundred seventy million, three hundred seventeen thousand, five hundred thirty-six".