640525366500 has 48 divisors (see below), whose sum is σ = 1865209871616. Its totient is φ = 170806764000.

The previous prime is 640525366477. The next prime is 640525366511. The reversal of 640525366500 is 5663525046.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 213506956 + ... + 213509955.

It is an arithmetic number, because the mean of its divisors is an integer number (38858538992).

Almost surely, 2^640525366500 is an apocalyptic number.

640525366500 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

640525366500 is an abundant number, since it is smaller than the sum of its proper divisors (1224684505116).

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

640525366500 is a wasteful number, since it uses less digits than its factorization.

640525366500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 427016933 (or 427016921 counting only the distinct ones).

The product of its (nonzero) digits is 648000, while the sum is 42.

The spelling of 640525366500 in words is "six hundred forty billion, five hundred twenty-five million, three hundred sixty-six thousand, five hundred".