25254817887 has 16 divisors (see below), whose sum is σ = 36277176320. Its totient is φ = 15535491552.

The previous prime is 25254817883. The next prime is 25254817919. The reversal of 25254817887 is 78871845252.

It is a happy number.

It is not a de Polignac number, because 25254817887 - 2² = 25254817883 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 (25254817883) 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, 19087 + ... + 225552.

It is an arithmetic number, because the mean of its divisors is an integer number (2267323520).

Almost surely, 2^25254817887 is an apocalyptic number.

25254817887 is a deficient number, since it is larger than the sum of its proper divisors (11022358433).

25254817887 is a wasteful number, since it uses less digits than its factorization.

25254817887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 247302.

The product of its digits is 10035200, while the sum is 57.

The spelling of 25254817887 in words is "twenty-five billion, two hundred fifty-four million, eight hundred seventeen thousand, eight hundred eighty-seven".