23151403520 has 80 divisors (see below), whose sum is σ = 63439028928. Its totient is φ = 7937617920.

The previous prime is 23151403507. The next prime is 23151403523. The reversal of 23151403520 is 2530415132.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (80).

It is a self number, because there is not a number n which added to its sum of digits gives 23151403520.

It is not an unprimeable number, because it can be changed into a prime (23151403523) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 628046 + ... + 663885.

Almost surely, 2^23151403520 is an apocalyptic number.

23151403520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

23151403520 is an abundant number, since it is smaller than the sum of its proper divisors (40287625408).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

23151403520 is an equidigital number, since it uses as much as digits as its factorization.

23151403520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1291961 (or 1291945 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 26.

Adding to 23151403520 its reverse (2530415132), we get a palindrome (25681818652).

The spelling of 23151403520 in words is "twenty-three billion, one hundred fifty-one million, four hundred three thousand, five hundred twenty".