25201255551 has 4 divisors (see below), whose sum is σ = 33601674072. Its totient is φ = 16800837032.

The previous prime is 25201255543. The next prime is 25201255589. The reversal of 25201255551 is 15555210252.

It is a happy number.

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 25201255551 - 2³ = 25201255543 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25201255591) 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, 4200209256 + ... + 4200209261.

It is an arithmetic number, because the mean of its divisors is an integer number (8400418518).

Almost surely, 2^25201255551 is an apocalyptic number.

25201255551 is a deficient number, since it is larger than the sum of its proper divisors (8400418521).

25201255551 is an equidigital number, since it uses as much as digits as its factorization.

25201255551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8400418520.

The product of its (nonzero) digits is 25000, while the sum is 33.

The spelling of 25201255551 in words is "twenty-five billion, two hundred one million, two hundred fifty-five thousand, five hundred fifty-one".