22661155116621 has 24 divisors (see below), whose sum is σ = 39377779987520. Its totient is φ = 12267692994816.

The previous prime is 22661155116571. The next prime is 22661155116623. The reversal of 22661155116621 is 12661155116622.

22661155116621 is a `hidden beast` number, since 2 + 2 + 6 + 6 + 1 + 1 + 5 + 5 + 1 + 16 + 621 = 666.

It is not a de Polignac number, because 22661155116621 - 2⁶ = 22661155116557 is a prime.

It is a super-2 number, since 2×22661155116621² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22661155116623) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9465811300 + ... + 9465813693.

Almost surely, 2^{22661155116621} is an apocalyptic number.

22661155116621 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

22661155116621 is a deficient number, since it is larger than the sum of its proper divisors (16716624870899).

22661155116621 is a wasteful number, since it uses less digits than its factorization.

22661155116621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18931625025 (or 18931625022 counting only the distinct ones).

The product of its digits is 259200, while the sum is 45.

Subtracting from 22661155116621 its reverse (12661155116622), we obtain a palindrome (9999999999999).

The spelling of 22661155116621 in words is "twenty-two trillion, six hundred sixty-one billion, one hundred fifty-five million, one hundred sixteen thousand, six hundred twenty-one".