640009714561 has 32 divisors (see below), whose sum is σ = 790981758720. Its totient is φ = 505509984000.

The previous prime is 640009714549. The next prime is 640009714583. The reversal of 640009714561 is 165417900046.

It is not a de Polignac number, because 640009714561 - 2⁷ = 640009714433 is a prime.

It is a super-2 number, since 2×640009714561² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (640009714541) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 18195051 + ... + 18230191.

It is an arithmetic number, because the mean of its divisors is an integer number (24718179960).

Almost surely, 2^640009714561 is an apocalyptic number.

It is an amenable number.

640009714561 is a deficient number, since it is larger than the sum of its proper divisors (150972044159).

640009714561 is a wasteful number, since it uses less digits than its factorization.

640009714561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38905.

The product of its (nonzero) digits is 181440, while the sum is 43.

The spelling of 640009714561 in words is "six hundred forty billion, nine million, seven hundred fourteen thousand, five hundred sixty-one".