25305145523 has 4 divisors (see below), whose sum is σ = 28920166320. Its totient is φ = 21690124728.

The previous prime is 25305145519. The next prime is 25305145529. The reversal of 25305145523 is 32554150352.

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

It is a cyclic number.

It is not a de Polignac number, because 25305145523 - 2² = 25305145519 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25305145529) 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, 1807510388 + ... + 1807510401.

It is an arithmetic number, because the mean of its divisors is an integer number (7230041580).

Almost surely, 2^25305145523 is an apocalyptic number.

25305145523 is a deficient number, since it is larger than the sum of its proper divisors (3615020797).

25305145523 is an equidigital number, since it uses as much as digits as its factorization.

25305145523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3615020796.

The product of its (nonzero) digits is 90000, while the sum is 35.

Adding to 25305145523 its reverse (32554150352), we get a palindrome (57859295875).

The spelling of 25305145523 in words is "twenty-five billion, three hundred five million, one hundred forty-five thousand, five hundred twenty-three".