22161681684 has 36 divisors (see below), whose sum is σ = 56024468500. Its totient is φ = 7386612480.

The previous prime is 22161681683. The next prime is 22161681697. The reversal of 22161681684 is 48618616122.

It is a happy number.

22161681684 is a `hidden beast` number, since 2 + 21 + 616 + 8 + 1 + 6 + 8 + 4 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 8665748100 + 13495933584 = 93090^2 + 116172^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×22161681684² (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 (22161681683) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 676974 + ... + 708954.

Almost surely, 2^22161681684 is an apocalyptic number.

It is an amenable number.

22161681684 is an abundant number, since it is smaller than the sum of its proper divisors (33862786816).

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

22161681684 is a wasteful number, since it uses less digits than its factorization.

22161681684 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51240 (or 51235 counting only the distinct ones).

The product of its digits is 221184, while the sum is 45.

The spelling of 22161681684 in words is "twenty-two billion, one hundred sixty-one million, six hundred eighty-one thousand, six hundred eighty-four".