25551431553 has 16 divisors (see below), whose sum is σ = 36209838080. Its totient is φ = 15981065424.

The previous prime is 25551431551. The next prime is 25551431557. The reversal of 25551431553 is 35513415552.

It is not a de Polignac number, because 25551431553 - 2¹ = 25551431551 is a prime.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25551431551) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2170201 + ... + 2181942.

It is an arithmetic number, because the mean of its divisors is an integer number (2263114880).

Almost surely, 2^25551431553 is an apocalyptic number.

It is an amenable number.

25551431553 is a deficient number, since it is larger than the sum of its proper divisors (10658406527).

25551431553 is a wasteful number, since it uses less digits than its factorization.

25551431553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4352268.

The product of its digits is 225000, while the sum is 39.

The spelling of 25551431553 in words is "twenty-five billion, five hundred fifty-one million, four hundred thirty-one thousand, five hundred fifty-three".