25165215533 has 4 divisors (see below), whose sum is σ = 25396089180. Its totient is φ = 24934341888.

The previous prime is 25165215497. The next prime is 25165215539. The reversal of 25165215533 is 33551256152.

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

It can be written as a sum of positive squares in 2 ways, for example, as 14991063844 + 10174151689 = 122438^2 + 100867^2 .

It is a cyclic number.

It is not a de Polignac number, because 25165215533 - 2¹⁰ = 25165214509 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25165215539) 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, 115436660 + ... + 115436877.

It is an arithmetic number, because the mean of its divisors is an integer number (6349022295).

Almost surely, 2^25165215533 is an apocalyptic number.

It is an amenable number.

25165215533 is a deficient number, since it is larger than the sum of its proper divisors (230873647).

25165215533 is a wasteful number, since it uses less digits than its factorization.

25165215533 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 230873646.

The product of its digits is 135000, while the sum is 38.

The spelling of 25165215533 in words is "twenty-five billion, one hundred sixty-five million, two hundred fifteen thousand, five hundred thirty-three".