16900991576778 has 32 divisors (see below), whose sum is σ = 35603512243200. Its totient is φ = 5333783633136.

The previous prime is 16900991576713. The next prime is 16900991576837. The reversal of 16900991576778 is 87767519900961.

It is a super-2 number, since 2×16900991576778² (a number of 27 digits) contains 22 as substring.

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, 46646548 + ... + 47007471.

It is an arithmetic number, because the mean of its divisors is an integer number (1112609757600).

Almost surely, 2^{16900991576778} is an apocalyptic number.

16900991576778 is an abundant number, since it is smaller than the sum of its proper divisors (18702520666422).

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

16900991576778 is a wasteful number, since it uses less digits than its factorization.

16900991576778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93655626.

The product of its (nonzero) digits is 360067680, while the sum is 75.

The spelling of 16900991576778 in words is "sixteen trillion, nine hundred billion, nine hundred ninety-one million, five hundred seventy-six thousand, seven hundred seventy-eight".