640619944942752 has 72 divisors (see below), whose sum is σ = 1823646901972896. Its totient is φ = 213319154272896.

The previous prime is 640619944942727. The next prime is 640619944942753. The reversal of 640619944942752 is 257249449916046.

640619944942752 is a `hidden beast` number, since 6 + 4 + 0 + 6 + 1 + 99 + 449 + 42 + 7 + 52 = 666.

It is a tau number, because it is divible by the number of its divisors (72).

It is a Harshad number since it is a multiple of its sum of digits (72).

It is not an unprimeable number, because it can be changed into a prime (640619944942753) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1149863598 + ... + 1150420589.

It is an arithmetic number, because the mean of its divisors is an integer number (25328429194068).

Almost surely, 2^{640619944942752} is an apocalyptic number.

It is an amenable number.

640619944942752 is an abundant number, since it is smaller than the sum of its proper divisors (1183026957030144).

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

640619944942752 is a wasteful number, since it uses less digits than its factorization.

640619944942752 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2300285170 (or 2300285159 counting only the distinct ones).

The product of its (nonzero) digits is 940584960, while the sum is 72.

The spelling of 640619944942752 in words is "six hundred forty trillion, six hundred nineteen billion, nine hundred forty-four million, nine hundred forty-two thousand, seven hundred fifty-two".