31664521611 has 24 divisors (see below), whose sum is σ = 49697955840. Its totient is φ = 19353524400.

The previous prime is 31664521579. The next prime is 31664521619. The reversal of 31664521611 is 11612546613.

31664521611 is a `hidden beast` number, since 3 + 1 + 6 + 645 + 2 + 1 + 6 + 1 + 1 = 666.

It is not a de Polignac number, because 31664521611 - 2⁵ = 31664521579 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31664521619) 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 23 ways as a sum of consecutive naturals, for example, 2981355 + ... + 2991956.

It is an arithmetic number, because the mean of its divisors is an integer number (2070748160).

Almost surely, 2^31664521611 is an apocalyptic number.

31664521611 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

31664521611 is a deficient number, since it is larger than the sum of its proper divisors (18033434229).

31664521611 is a wasteful number, since it uses less digits than its factorization.

31664521611 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5973367 (or 5973364 counting only the distinct ones).

The product of its digits is 25920, while the sum is 36.

The spelling of 31664521611 in words is "thirty-one billion, six hundred sixty-four million, five hundred twenty-one thousand, six hundred eleven".