23155444515 has 32 divisors (see below), whose sum is σ = 42349547520. Its totient is φ = 10583305344.

The previous prime is 23155444489. The next prime is 23155444519. The reversal of 23155444515 is 51544455132.

It is not a de Polignac number, because 23155444515 - 2¹⁷ = 23155313443 is a prime.

It is a super-2 number, since 2×23155444515² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (23155444519) 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, 616701 + ... + 653169.

It is an arithmetic number, because the mean of its divisors is an integer number (1323423360).

Almost surely, 2^23155444515 is an apocalyptic number.

23155444515 is a deficient number, since it is larger than the sum of its proper divisors (19194103005).

23155444515 is a wasteful number, since it uses less digits than its factorization.

23155444515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42531.

The product of its digits is 240000, while the sum is 39.

Adding to 23155444515 its reverse (51544455132), we get a palindrome (74699899647).

The spelling of 23155444515 in words is "twenty-three billion, one hundred fifty-five million, four hundred forty-four thousand, five hundred fifteen".