23155444431 has 32 divisors (see below), whose sum is σ = 39271288320. Its totient is φ = 13209305472.

The previous prime is 23155444427. The next prime is 23155444447. The reversal of 23155444431 is 13444455132.

23155444431 is a `hidden beast` number, since 2 + 31 + 554 + 4 + 44 + 31 = 666.

It is not a de Polignac number, because 23155444431 - 2² = 23155444427 is a prime.

It is a super-2 number, since 2×23155444431² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23155444471) 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, 8776 + ... + 215378.

It is an arithmetic number, because the mean of its divisors is an integer number (1227227760).

Almost surely, 2^23155444431 is an apocalyptic number.

23155444431 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

23155444431 is a deficient number, since it is larger than the sum of its proper divisors (16115843889).

23155444431 is a wasteful number, since it uses less digits than its factorization.

23155444431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 207212 (or 207206 counting only the distinct ones).

The product of its digits is 115200, while the sum is 36.

Adding to 23155444431 its reverse (13444455132), we get a palindrome (36599899563).

The spelling of 23155444431 in words is "twenty-three billion, one hundred fifty-five million, four hundred forty-four thousand, four hundred thirty-one".