1978879950958 has 4 divisors (see below), whose sum is σ = 2968319926440. Its totient is φ = 989439975478.

The previous prime is 1978879950899. The next prime is 1978879950979. The reversal of 1978879950958 is 8590599788791.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a Smith number, since the sum of its digits (85) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 494719987738 + ... + 494719987741.

It is an arithmetic number, because the mean of its divisors is an integer number (742079981610).

Almost surely, 2^{1978879950958} is an apocalyptic number.

1978879950958 is a deficient number, since it is larger than the sum of its proper divisors (989439975482).

1978879950958 is an equidigital number, since it uses as much as digits as its factorization.

1978879950958 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 989439975481.

The product of its (nonzero) digits is 4115059200, while the sum is 85.

The spelling of 1978879950958 in words is "one trillion, nine hundred seventy-eight billion, eight hundred seventy-nine million, nine hundred fifty thousand, nine hundred fifty-eight".