25654820887 has 4 divisors (see below), whose sum is σ = 27163928016. Its totient is φ = 24145713760.

The previous prime is 25654820879. The next prime is 25654820903. The reversal of 25654820887 is 78802845652.

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 25654820887 - 2³ = 25654820879 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 (25654820987) 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, 754553539 + ... + 754553572.

It is an arithmetic number, because the mean of its divisors is an integer number (6790982004).

Almost surely, 2^25654820887 is an apocalyptic number.

25654820887 is a deficient number, since it is larger than the sum of its proper divisors (1509107129).

25654820887 is a wasteful number, since it uses less digits than its factorization.

25654820887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1509107128.

The product of its (nonzero) digits is 8601600, while the sum is 55.

The spelling of 25654820887 in words is "twenty-five billion, six hundred fifty-four million, eight hundred twenty thousand, eight hundred eighty-seven".