640626915600 has 240 divisors, whose sum is σ = 2605894343040. Its totient is φ = 146428992000.

The previous prime is 640626915541. The next prime is 640626915637. The reversal of 640626915600 is 6519626046.

640626915600 is a `hidden beast` number, since 6 + 4 + 0 + 6 + 26 + 9 + 15 + 600 = 666.

It is a tau number, because it is divible by the number of its divisors (240).

It is a Harshad number since it is a multiple of its sum of digits (45).

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 47 ways as a sum of consecutive naturals, for example, 4161351 + ... + 4312550.

It is an arithmetic number, because the mean of its divisors is an integer number (10857893096).

Almost surely, 2^640626915600 is an apocalyptic number.

640626915600 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

640626915600 is an abundant number, since it is smaller than the sum of its proper divisors (1965267427440).

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

640626915600 is a wasteful number, since it uses less digits than its factorization.

640626915600 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8473935 (or 8473918 counting only the distinct ones).

The product of its (nonzero) digits is 466560, while the sum is 45.

The spelling of 640626915600 in words is "six hundred forty billion, six hundred twenty-six million, nine hundred fifteen thousand, six hundred".