22151611566 has 80 divisors (see below), whose sum is σ = 57108031200. Its totient is φ = 6286507200.

The previous prime is 22151611561. The next prime is 22151611571. The reversal of 22151611566 is 66511615122.

22151611566 is a `hidden beast` number, since 2 + 21 + 516 + 115 + 6 + 6 = 666.

It is an interprime number because it is at equal distance from previous prime (22151611561) and next prime (22151611571).

It is a self number, because there is not a number n which added to its sum of digits gives 22151611566.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22151611561) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 103416 + ... + 234516.

It is an arithmetic number, because the mean of its divisors is an integer number (713850390).

Almost surely, 2^22151611566 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 22151611566, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28554015600).

22151611566 is an abundant number, since it is smaller than the sum of its proper divisors (34956419634).

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

22151611566 is a wasteful number, since it uses less digits than its factorization.

22151611566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131271 (or 131262 counting only the distinct ones).

The product of its digits is 21600, while the sum is 36.

The spelling of 22151611566 in words is "twenty-two billion, one hundred fifty-one million, six hundred eleven thousand, five hundred sixty-six".