16557700081 has 16 divisors (see below), whose sum is σ = 18774887040. Its totient is φ = 14475732480.

The previous prime is 16557700079. The next prime is 16557700087. The reversal of 16557700081 is 18000775561.

It is a cyclic number.

It is not a de Polignac number, because 16557700081 - 2¹ = 16557700079 is a prime.

It is a super-2 number, since 2×16557700081² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (16557700087) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1303521 + ... + 1316161.

It is an arithmetic number, because the mean of its divisors is an integer number (1173430440).

Almost surely, 2^16557700081 is an apocalyptic number.

It is an amenable number.

16557700081 is a deficient number, since it is larger than the sum of its proper divisors (2217186959).

16557700081 is a wasteful number, since it uses less digits than its factorization.

16557700081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17976.

The product of its (nonzero) digits is 58800, while the sum is 40.

The spelling of 16557700081 in words is "sixteen billion, five hundred fifty-seven million, seven hundred thousand, eighty-one".