16491776978 has 8 divisors (see below), whose sum is σ = 26039647920. Its totient is φ = 7811894340.

The previous prime is 16491776957. The next prime is 16491777019. The reversal of 16491776978 is 87967719461.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 216997028 + ... + 216997103.

It is an arithmetic number, because the mean of its divisors is an integer number (3254955990).

Almost surely, 2^16491776978 is an apocalyptic number.

16491776978 is a deficient number, since it is larger than the sum of its proper divisors (9547870942).

16491776978 is a wasteful number, since it uses less digits than its factorization.

16491776978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 433994152.

The product of its digits is 32006016, while the sum is 65.

The spelling of 16491776978 in words is "sixteen billion, four hundred ninety-one million, seven hundred seventy-six thousand, nine hundred seventy-eight".