40991322690918 has 24 divisors (see below), whose sum is σ = 90319863558600. Its totient is φ = 13432184836224.

The previous prime is 40991322690883. The next prime is 40991322690949. The reversal of 40991322690918 is 81909622319904.

40991322690918 is a `hidden beast` number, since 409 + 9 + 1 + 32 + 26 + 90 + 91 + 8 = 666.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 19299115083 + ... + 19299117206.

It is an arithmetic number, because the mean of its divisors is an integer number (3763327648275).

Almost surely, 2^{40991322690918} is an apocalyptic number.

40991322690918 is an abundant number, since it is smaller than the sum of its proper divisors (49328540867682).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

40991322690918 is a wasteful number, since it uses less digits than its factorization.

40991322690918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38598232356 (or 38598232353 counting only the distinct ones).

The product of its (nonzero) digits is 15116544, while the sum is 63.

The spelling of 40991322690918 in words is "forty trillion, nine hundred ninety-one billion, three hundred twenty-two million, six hundred ninety thousand, nine hundred eighteen".