640446636562532 has 24 divisors (see below), whose sum is σ = 1176544941976320. Its totient is φ = 304641101040480.

The previous prime is 640446636562529. The next prime is 640446636562559. The reversal of 640446636562532 is 235265636644046.

It is a super-2 number, since 2×640446636562532² (a number of 30 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (62).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43770265823 + ... + 43770280454.

It is an arithmetic number, because the mean of its divisors is an integer number (49022705915680).

Almost surely, 2^{640446636562532} is an apocalyptic number.

640446636562532 is a gapful number since it is divisible by the number (62) formed by its first and last digit.

It is an amenable number.

640446636562532 is a deficient number, since it is larger than the sum of its proper divisors (536098305413788).

640446636562532 is a wasteful number, since it uses less digits than its factorization.

640446636562532 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87540546371 (or 87540546369 counting only the distinct ones).

The product of its (nonzero) digits is 447897600, while the sum is 62.

The spelling of 640446636562532 in words is "six hundred forty trillion, four hundred forty-six billion, six hundred thirty-six million, five hundred sixty-two thousand, five hundred thirty-two".