16458499978 has 16 divisors (see below), whose sum is σ = 25551511560. Its totient is φ = 7941606400.

The previous prime is 16458499961. The next prime is 16458500027. The reversal of 16458499978 is 87999485461.

It can be written as a sum of positive squares in 4 ways, for example, as 15801244209 + 657255769 = 125703^2 + 25637^2 .

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, 52518 + ... + 188878.

Almost surely, 2^16458499978 is an apocalyptic number.

16458499978 is a deficient number, since it is larger than the sum of its proper divisors (9093011582).

16458499978 is a wasteful number, since it uses less digits than its factorization.

16458499978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138473.

The product of its digits is 156764160, while the sum is 70.

The spelling of 16458499978 in words is "sixteen billion, four hundred fifty-eight million, four hundred ninety-nine thousand, nine hundred seventy-eight".