31640603499 has 96 divisors (see below), whose sum is σ = 52220313600. Its totient is φ = 18355170240.

The previous prime is 31640603483. The next prime is 31640603531. The reversal of 31640603499 is 99430604613.

31640603499 is a `hidden beast` number, since 31 + 6 + 4 + 0 + 603 + 4 + 9 + 9 = 666.

It is not a de Polignac number, because 31640603499 - 2⁴ = 31640603483 is a prime.

It is a super-2 number, since 2×31640603499² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (31640603419) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 16946364 + ... + 16948230.

It is an arithmetic number, because the mean of its divisors is an integer number (543961600).

Almost surely, 2^31640603499 is an apocalyptic number.

31640603499 is a deficient number, since it is larger than the sum of its proper divisors (20579710101).

31640603499 is a wasteful number, since it uses less digits than its factorization.

31640603499 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2085 (or 2082 counting only the distinct ones).

The product of its (nonzero) digits is 419904, while the sum is 45.

The spelling of 31640603499 in words is "thirty-one billion, six hundred forty million, six hundred three thousand, four hundred ninety-nine".