99731664631 has 2 divisors, whose sum is σ = 99731664632. Its totient is φ = 99731664630.

The previous prime is 99731664629. The next prime is 99731664649. The reversal of 99731664631 is 13646613799.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 99731664631 - 2¹ = 99731664629 is a prime.

It is a super-2 number, since 2×99731664631² (a number of 23 digits) contains 22 as substring.

Together with 99731664629, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99731664611) 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 as a sum of consecutive naturals, namely, 49865832315 + 49865832316.

It is an arithmetic number, because the mean of its divisors is an integer number (49865832316).

Almost surely, 2^99731664631 is an apocalyptic number.

99731664631 is a deficient number, since it is larger than the sum of its proper divisors (1).

99731664631 is an equidigital number, since it uses as much as digits as its factorization.

99731664631 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4408992, while the sum is 55.

The spelling of 99731664631 in words is "ninety-nine billion, seven hundred thirty-one million, six hundred sixty-four thousand, six hundred thirty-one".