991297920058 has 16 divisors (see below), whose sum is σ = 1512348696000. Its totient is φ = 487183902912.

The previous prime is 991297920047. The next prime is 991297920061. The reversal of 991297920058 is 850029792199.

It is a super-2 number, since 2×991297920058² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 991297919978 and 991297920005.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 351538 + ... + 1451266.

It is an arithmetic number, because the mean of its divisors is an integer number (94521793500).

Almost surely, 2^991297920058 is an apocalyptic number.

991297920058 is a deficient number, since it is larger than the sum of its proper divisors (521050775942).

991297920058 is a wasteful number, since it uses less digits than its factorization.

991297920058 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1107429.

The product of its (nonzero) digits is 7348320, while the sum is 61.

The spelling of 991297920058 in words is "nine hundred ninety-one billion, two hundred ninety-seven million, nine hundred twenty thousand, fifty-eight".