25602001987 has 4 divisors (see below), whose sum is σ = 25602933376. Its totient is φ = 25601070600.

The previous prime is 25602001981. The next prime is 25602002039. The reversal of 25602001987 is 78910020652.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25602001987 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25602001981) 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, 423168 + ... + 479869.

It is an arithmetic number, because the mean of its divisors is an integer number (6400733344).

Almost surely, 2^25602001987 is an apocalyptic number.

25602001987 is a deficient number, since it is larger than the sum of its proper divisors (931389).

25602001987 is an equidigital number, since it uses as much as digits as its factorization.

25602001987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 931388.

The product of its (nonzero) digits is 60480, while the sum is 40.

The spelling of 25602001987 in words is "twenty-five billion, six hundred two million, one thousand, nine hundred eighty-seven".