25205242155 has 16 divisors (see below), whose sum is σ = 40330459680. Its totient is φ = 13442105088.

The previous prime is 25205242141. The next prime is 25205242169. The reversal of 25205242155 is 55124250252.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (25205242141) and next prime (25205242169).

It is not a de Polignac number, because 25205242155 - 2⁹ = 25205241643 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 416079 + ... + 472791.

It is an arithmetic number, because the mean of its divisors is an integer number (2520653730).

Almost surely, 2^25205242155 is an apocalyptic number.

25205242155 is a deficient number, since it is larger than the sum of its proper divisors (15125217525).

25205242155 is a wasteful number, since it uses less digits than its factorization.

25205242155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86350.

The product of its (nonzero) digits is 40000, while the sum is 33.

The spelling of 25205242155 in words is "twenty-five billion, two hundred five million, two hundred forty-two thousand, one hundred fifty-five".