23166305255621 has 32 divisors (see below), whose sum is σ = 25415308707840. Its totient is φ = 20941546147200.

The previous prime is 23166305255581. The next prime is 23166305255659. The reversal of 23166305255621 is 12655250366132.

It is a cyclic number.

It is not a de Polignac number, because 23166305255621 - 2³⁴ = 23149125386437 is a prime.

It is a super-2 number, since 2×23166305255621² (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 (23166305245621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2555008730 + ... + 2555017796.

It is an arithmetic number, because the mean of its divisors is an integer number (794228397120).

Almost surely, 2^{23166305255621} is an apocalyptic number.

It is an amenable number.

23166305255621 is a deficient number, since it is larger than the sum of its proper divisors (2249003452219).

23166305255621 is a wasteful number, since it uses less digits than its factorization.

23166305255621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11225.

The product of its (nonzero) digits is 1944000, while the sum is 47.

The spelling of 23166305255621 in words is "twenty-three trillion, one hundred sixty-six billion, three hundred five million, two hundred fifty-five thousand, six hundred twenty-one".