313978198161 has 16 divisors (see below), whose sum is σ = 436899363840. Its totient is φ = 200190421200.

The previous prime is 313978198133. The next prime is 313978198181. The reversal of 313978198161 is 161891879313.

It is a happy number.

It is not a de Polignac number, because 313978198161 - 2⁷ = 313978198033 is a prime.

It is not an unprimeable number, because it can be changed into a prime (313978198181) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 197710 + ... + 816728.

It is an arithmetic number, because the mean of its divisors is an integer number (27306210240).

Almost surely, 2^313978198161 is an apocalyptic number.

It is an amenable number.

313978198161 is a deficient number, since it is larger than the sum of its proper divisors (122921165679).

313978198161 is a wasteful number, since it uses less digits than its factorization.

313978198161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 626396.

The product of its digits is 1959552, while the sum is 57.

The spelling of 313978198161 in words is "three hundred thirteen billion, nine hundred seventy-eight million, one hundred ninety-eight thousand, one hundred sixty-one".