22161878736 has 40 divisors (see below), whose sum is σ = 57256975200. Its totient is φ = 7386589056.

The previous prime is 22161878729. The next prime is 22161878743. The reversal of 22161878736 is 63787816122.

It is an interprime number because it is at equal distance from previous prime (22161878729) and next prime (22161878743).

It is a super-2 number, since 2×22161878736² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

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, 816715 + ... + 843413.

It is an arithmetic number, because the mean of its divisors is an integer number (1431424380).

Almost surely, 2^22161878736 is an apocalyptic number.

It is an amenable number.

22161878736 is an abundant number, since it is smaller than the sum of its proper divisors (35095096464).

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

22161878736 is a wasteful number, since it uses less digits than its factorization.

22161878736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44003 (or 43997 counting only the distinct ones).

The product of its digits is 1354752, while the sum is 51.

The spelling of 22161878736 in words is "twenty-two billion, one hundred sixty-one million, eight hundred seventy-eight thousand, seven hundred thirty-six".