25981251090 has 32 divisors (see below), whose sum is σ = 64505177280. Its totient is φ = 6689425344.

The previous prime is 25981251083. The next prime is 25981251143. The reversal of 25981251090 is 9015218952.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14930884 + ... + 14932623.

It is an arithmetic number, because the mean of its divisors is an integer number (2015786790).

Almost surely, 2^25981251090 is an apocalyptic number.

25981251090 is an abundant number, since it is smaller than the sum of its proper divisors (38523926190).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

25981251090 is a wasteful number, since it uses less digits than its factorization.

25981251090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29863546.

The product of its (nonzero) digits is 64800, while the sum is 42.

The spelling of 25981251090 in words is "twenty-five billion, nine hundred eighty-one million, two hundred fifty-one thousand, ninety".