25321331523 has 4 divisors (see below), whose sum is σ = 33761775368. Its totient is φ = 16880887680.

The previous prime is 25321331509. The next prime is 25321331533. The reversal of 25321331523 is 32513312352.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 25321331523 - 2¹³ = 25321323331 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25321331533) 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, 4220221918 + ... + 4220221923.

It is an arithmetic number, because the mean of its divisors is an integer number (8440443842).

Almost surely, 2^25321331523 is an apocalyptic number.

25321331523 is a deficient number, since it is larger than the sum of its proper divisors (8440443845).

25321331523 is an equidigital number, since it uses as much as digits as its factorization.

25321331523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8440443844.

The product of its digits is 16200, while the sum is 30.

Adding to 25321331523 its reverse (32513312352), we get a palindrome (57834643875).

The spelling of 25321331523 in words is "twenty-five billion, three hundred twenty-one million, three hundred thirty-one thousand, five hundred twenty-three".