25971189540 has 96 divisors (see below), whose sum is σ = 75301349760. Its totient is φ = 6680217600.

The previous prime is 25971189529. The next prime is 25971189581. The reversal of 25971189540 is 4598117952.

It is a super-2 number, since 2×25971189540² (a number of 22 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (51) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1891500 + ... + 1905180.

It is an arithmetic number, because the mean of its divisors is an integer number (784389060).

Almost surely, 2^25971189540 is an apocalyptic number.

25971189540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25971189540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37650674880).

25971189540 is an abundant number, since it is smaller than the sum of its proper divisors (49330160220).

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

25971189540 is a wasteful number, since it uses less digits than its factorization.

25971189540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14813 (or 14811 counting only the distinct ones).

The product of its (nonzero) digits is 907200, while the sum is 51.

The spelling of 25971189540 in words is "twenty-five billion, nine hundred seventy-one million, one hundred eighty-nine thousand, five hundred forty".