997558058779 has 4 divisors (see below), whose sum is σ = 1031956612560. Its totient is φ = 963159505000.

The previous prime is 997558058729. The next prime is 997558058863. The reversal of 997558058779 is 977850855799.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 977850855799 = 2879 ⋅339649481.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-997558058779 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 997558058699 and 997558058708.

It is not an unprimeable number, because it can be changed into a prime (997558058729) 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 in 3 ways as a sum of consecutive naturals, for example, 17199276847 + ... + 17199276904.

It is an arithmetic number, because the mean of its divisors is an integer number (257989153140).

Almost surely, 2^997558058779 is an apocalyptic number.

997558058779 is a deficient number, since it is larger than the sum of its proper divisors (34398553781).

997558058779 is a wasteful number, since it uses less digits than its factorization.

997558058779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34398553780.

The product of its (nonzero) digits is 2000376000, while the sum is 79.

The spelling of 997558058779 in words is "nine hundred ninety-seven billion, five hundred fifty-eight million, fifty-eight thousand, seven hundred seventy-nine".