23866851121 has 27 divisors (see below), whose sum is σ = 25886081451. Its totient is φ = 22001705424.

The previous prime is 23866851101. The next prime is 23866851149. The reversal of 23866851121 is 12115866832.

The square root of 23866851121 is 154489.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 21710549025 + 2156302096 = 147345^2 + 46436^2 .

It is not a de Polignac number, because 23866851121 - 2¹¹ = 23866849073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23866851101) 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 26 ways as a sum of consecutive naturals, for example, 137958591 + ... + 137958763.

Almost surely, 2^23866851121 is an apocalyptic number.

23866851121 is the 154489-th square number.

23866851121 is the 77245-th centered octagonal number.

It is an amenable number.

23866851121 is a deficient number, since it is larger than the sum of its proper divisors (2019230330).

23866851121 is an frugal number, since it uses more digits than its factorization.

23866851121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 478 (or 239 counting only the distinct ones).

The product of its digits is 138240, while the sum is 43.

The spelling of 23866851121 in words is "twenty-three billion, eight hundred sixty-six million, eight hundred fifty-one thousand, one hundred twenty-one".