23166540621663 has 16 divisors (see below), whose sum is σ = 30996998739456. Its totient is φ = 15390304181280.

The previous prime is 23166540621647. The next prime is 23166540621671. The reversal of 23166540621663 is 36612604566132.

It is not a de Polignac number, because 23166540621663 - 2⁴ = 23166540621647 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23166540621683) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9219331 + ... + 11459892.

It is an arithmetic number, because the mean of its divisors is an integer number (1937312421216).

Almost surely, 2^{23166540621663} is an apocalyptic number.

23166540621663 is a deficient number, since it is larger than the sum of its proper divisors (7830458117793).

23166540621663 is a wasteful number, since it uses less digits than its factorization.

23166540621663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20680534.

The product of its (nonzero) digits is 5598720, while the sum is 51.

The spelling of 23166540621663 in words is "twenty-three trillion, one hundred sixty-six billion, five hundred forty million, six hundred twenty-one thousand, six hundred sixty-three".