16451191660 has 24 divisors (see below), whose sum is σ = 34554774240. Its totient is φ = 6579091584.

The previous prime is 16451191643. The next prime is 16451191697. The reversal of 16451191660 is 6619115461.

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, 13657 + ... + 181903.

It is an arithmetic number, because the mean of its divisors is an integer number (1439782260).

Almost surely, 2^16451191660 is an apocalyptic number.

16451191660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16451191660 is an abundant number, since it is smaller than the sum of its proper divisors (18103582580).

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

16451191660 is a wasteful number, since it uses less digits than its factorization.

16451191660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173145 (or 173143 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 40.

The spelling of 16451191660 in words is "sixteen billion, four hundred fifty-one million, one hundred ninety-one thousand, six hundred sixty".