25870861825 has 24 divisors (see below), whose sum is σ = 32199376608. Its totient is φ = 20619751680.

The previous prime is 25870861823. The next prime is 25870861831. The reversal of 25870861825 is 52816807852.

It is not a de Polignac number, because 25870861825 - 2¹ = 25870861823 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25870861823) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8928777 + ... + 8931673.

It is an arithmetic number, because the mean of its divisors is an integer number (1341640692).

Almost surely, 2^25870861825 is an apocalyptic number.

25870861825 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

25870861825 is a deficient number, since it is larger than the sum of its proper divisors (6328514783).

25870861825 is a wasteful number, since it uses less digits than its factorization.

25870861825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4113 (or 4108 counting only the distinct ones).

The product of its (nonzero) digits is 2150400, while the sum is 52.

The spelling of 25870861825 in words is "twenty-five billion, eight hundred seventy million, eight hundred sixty-one thousand, eight hundred twenty-five".