640443322995840 has 512 divisors, whose sum is σ = 2791676030169600. Its totient is φ = 135126502981632.

The previous prime is 640443322995757. The next prime is 640443322995841. The reversal of 640443322995840 is 48599223344046.

640443322995840 is a `hidden beast` number, since 6 + 4 + 0 + 4 + 4 + 332 + 299 + 5 + 8 + 4 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is not an unprimeable number, because it can be changed into a prime (640443322995841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 202068687 + ... + 205213646.

It is an arithmetic number, because the mean of its divisors is an integer number (5452492246425).

Almost surely, 2^{640443322995840} is an apocalyptic number.

640443322995840 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

640443322995840 is an abundant number, since it is smaller than the sum of its proper divisors (2151232707173760).

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

640443322995840 is a wasteful number, since it uses less digits than its factorization.

640443322995840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 407282381 (or 407282363 counting only the distinct ones).

The product of its (nonzero) digits is 179159040, while the sum is 63.

The spelling of 640443322995840 in words is "six hundred forty trillion, four hundred forty-three billion, three hundred twenty-two million, nine hundred ninety-five thousand, eight hundred forty".