25345154521 has 4 divisors (see below), whose sum is σ = 25582025232. Its totient is φ = 25108283812.

The previous prime is 25345154491. The next prime is 25345154533. The reversal of 25345154521 is 12545154352.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 25345154521 - 2¹⁷ = 25345023449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25345154591) 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, 118435195 + ... + 118435408.

It is an arithmetic number, because the mean of its divisors is an integer number (6395506308).

Almost surely, 2^25345154521 is an apocalyptic number.

It is an amenable number.

25345154521 is a deficient number, since it is larger than the sum of its proper divisors (236870711).

25345154521 is a wasteful number, since it uses less digits than its factorization.

25345154521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 236870710.

The product of its digits is 120000, while the sum is 37.

The spelling of 25345154521 in words is "twenty-five billion, three hundred forty-five million, one hundred fifty-four thousand, five hundred twenty-one".