23172120537 has 4 divisors (see below), whose sum is σ = 30896160720. Its totient is φ = 15448080356.

The previous prime is 23172120533. The next prime is 23172120547. The reversal of 23172120537 is 73502127132.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 23172120537 - 2² = 23172120533 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 23172120498 and 23172120507.

It is not an unprimeable number, because it can be changed into a prime (23172120533) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3862020087 + ... + 3862020092.

It is an arithmetic number, because the mean of its divisors is an integer number (7724040180).

Almost surely, 2^23172120537 is an apocalyptic number.

It is an amenable number.

23172120537 is a deficient number, since it is larger than the sum of its proper divisors (7724040183).

23172120537 is an equidigital number, since it uses as much as digits as its factorization.

23172120537 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7724040182.

The product of its (nonzero) digits is 17640, while the sum is 33.

Adding to 23172120537 its reverse (73502127132), we get a palindrome (96674247669).

The spelling of 23172120537 in words is "twenty-three billion, one hundred seventy-two million, one hundred twenty thousand, five hundred thirty-seven".