22161881751 has 32 divisors (see below), whose sum is σ = 34069766400. Its totient is φ = 12719347200.

The previous prime is 22161881747. The next prime is 22161881761. The reversal of 22161881751 is 15718816122.

It is not a de Polignac number, because 22161881751 - 2² = 22161881747 is a prime.

It is a super-2 number, since 2×22161881751² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22161881701) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 366225 + ... + 422426.

It is an arithmetic number, because the mean of its divisors is an integer number (1064680200).

Almost surely, 2^22161881751 is an apocalyptic number.

22161881751 is a deficient number, since it is larger than the sum of its proper divisors (11907884649).

22161881751 is a wasteful number, since it uses less digits than its factorization.

22161881751 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 788719.

The product of its digits is 53760, while the sum is 42.

The spelling of 22161881751 in words is "twenty-two billion, one hundred sixty-one million, eight hundred eighty-one thousand, seven hundred fifty-one".