99766631 has 2 divisors, whose sum is σ = 99766632. Its totient is φ = 99766630.

The previous prime is 99766621. The next prime is 99766633. The reversal of 99766631 is 13666799.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 99766631 - 2¹⁸ = 99504487 is a prime.

It is a super-2 number, since 2×99766631² = 19906761322180322, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 99766633, it forms a pair of twin primes.

It is a Chen prime.

It is a nialpdrome in base 10.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99766633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49883315 + 49883316.

It is an arithmetic number, because the mean of its divisors is an integer number (49883316).

Almost surely, 2^99766631 is an apocalyptic number.

99766631 is a deficient number, since it is larger than the sum of its proper divisors (1).

99766631 is an equidigital number, since it uses as much as digits as its factorization.

99766631 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 367416, while the sum is 47.

The square root of 99766631 is about 9988.3247344087. The cubic root of 99766631 is about 463.7975344751.

The spelling of 99766631 in words is "ninety-nine million, seven hundred sixty-six thousand, six hundred thirty-one".