2491349667978 has 16 divisors (see below), whose sum is σ = 5006314027296. Its totient is φ = 826514107440.

The previous prime is 2491349667959. The next prime is 2491349667991. The reversal of 2491349667978 is 8797669431942.

It is a super-4 number, since 4×2491349667978⁴ (a number of 51 digits) contains 4444 as substring.

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, 983944101 + ... + 983946632.

It is an arithmetic number, because the mean of its divisors is an integer number (312894626706).

Almost surely, 2^{2491349667978} is an apocalyptic number.

2491349667978 is an abundant number, since it is smaller than the sum of its proper divisors (2514964359318).

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

2491349667978 is a wasteful number, since it uses less digits than its factorization.

2491349667978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1967890949.

The product of its digits is 987614208, while the sum is 75.

The spelling of 2491349667978 in words is "two trillion, four hundred ninety-one billion, three hundred forty-nine million, six hundred sixty-seven thousand, nine hundred seventy-eight".