16623697818 has 64 divisors (see below), whose sum is σ = 40950024192. Its totient is φ = 4381041600.

The previous prime is 16623697807. The next prime is 16623697861. The reversal of 16623697818 is 81879632661.

It is a super-2 number, since 2×16623697818² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 781755 + ... + 802737.

It is an arithmetic number, because the mean of its divisors is an integer number (639844128).

Almost surely, 2^16623697818 is an apocalyptic number.

16623697818 is an abundant number, since it is smaller than the sum of its proper divisors (24326326374).

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

16623697818 is a wasteful number, since it uses less digits than its factorization.

16623697818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22459.

The product of its digits is 5225472, while the sum is 57.

The spelling of 16623697818 in words is "sixteen billion, six hundred twenty-three million, six hundred ninety-seven thousand, eight hundred eighteen".