23172120515 has 8 divisors (see below), whose sum is σ = 28221568080. Its totient is φ = 18261014112.

The previous prime is 23172120509. The next prime is 23172120533. The reversal of 23172120515 is 51502127132.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 23172120515 - 2⁶ = 23172120451 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34584920 + ... + 34585589.

It is an arithmetic number, because the mean of its divisors is an integer number (3527696010).

Almost surely, 2^23172120515 is an apocalyptic number.

23172120515 is a deficient number, since it is larger than the sum of its proper divisors (5049447565).

23172120515 is an equidigital number, since it uses as much as digits as its factorization.

23172120515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69170581.

The product of its (nonzero) digits is 4200, while the sum is 29.

Adding to 23172120515 its reverse (51502127132), we get a palindrome (74674247647).

The spelling of 23172120515 in words is "twenty-three billion, one hundred seventy-two million, one hundred twenty thousand, five hundred fifteen".