640365536544350 has 48 divisors (see below), whose sum is σ = 1206167687589120. Its totient is φ = 252901586901600.

The previous prime is 640365536544347. The next prime is 640365536544379. The reversal of 640365536544350 is 53445635563046.

It is a self number, because there is not a number n which added to its sum of digits gives 640365536544350.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 479380469 + ... + 480714431.

It is an arithmetic number, because the mean of its divisors is an integer number (25128493491440).

Almost surely, 2^{640365536544350} is an apocalyptic number.

640365536544350 is a deficient number, since it is larger than the sum of its proper divisors (565802151044770).

640365536544350 is a wasteful number, since it uses less digits than its factorization.

640365536544350 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1455585 (or 1455580 counting only the distinct ones).

The product of its (nonzero) digits is 233280000, while the sum is 59.

The spelling of 640365536544350 in words is "six hundred forty trillion, three hundred sixty-five billion, five hundred thirty-six million, five hundred forty-four thousand, three hundred fifty".