23166115720557 has 32 divisors (see below), whose sum is σ = 31168110321792. Its totient is φ = 15304658863104.

The previous prime is 23166115720547. The next prime is 23166115720603. The reversal of 23166115720557 is 75502751166132.

It is not a de Polignac number, because 23166115720557 - 2⁴ = 23166115720541 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23166115720547) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 459957658 + ... + 460008020.

It is an arithmetic number, because the mean of its divisors is an integer number (974003447556).

Almost surely, 2^{23166115720557} is an apocalyptic number.

It is an amenable number.

23166115720557 is a deficient number, since it is larger than the sum of its proper divisors (8001994601235).

23166115720557 is a wasteful number, since it uses less digits than its factorization.

23166115720557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53117.

The product of its (nonzero) digits is 2646000, while the sum is 51.

Adding to 23166115720557 its reverse (75502751166132), we get a palindrome (98668866886689).

The spelling of 23166115720557 in words is "twenty-three trillion, one hundred sixty-six billion, one hundred fifteen million, seven hundred twenty thousand, five hundred fifty-seven".