991626983023 has 2 divisors, whose sum is σ = 991626983024. Its totient is φ = 991626983022.

The previous prime is 991626983003. The next prime is 991626983069. The reversal of 991626983023 is 320389626199.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 991626983023 - 2³³ = 983037048431 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (991626983003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 495813491511 + 495813491512.

It is an arithmetic number, because the mean of its divisors is an integer number (495813491512).

Almost surely, 2^991626983023 is an apocalyptic number.

991626983023 is a deficient number, since it is larger than the sum of its proper divisors (1).

991626983023 is an equidigital number, since it uses as much as digits as its factorization.

991626983023 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7558272, while the sum is 58.

The spelling of 991626983023 in words is "nine hundred ninety-one billion, six hundred twenty-six million, nine hundred eighty-three thousand, twenty-three".