16491578394 has 32 divisors (see below), whose sum is σ = 33075029376. Its totient is φ = 5481904320.

The previous prime is 16491578377. The next prime is 16491578419. The reversal of 16491578394 is 49387519461.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3868224 + ... + 3872484.

It is an arithmetic number, because the mean of its divisors is an integer number (1033594668).

Almost surely, 2^16491578394 is an apocalyptic number.

16491578394 is an abundant number, since it is smaller than the sum of its proper divisors (16583450982).

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

16491578394 is a wasteful number, since it uses less digits than its factorization.

16491578394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5910.

The product of its digits is 6531840, while the sum is 57.

The spelling of 16491578394 in words is "sixteen billion, four hundred ninety-one million, five hundred seventy-eight thousand, three hundred ninety-four".