25291017120 has 192 divisors, whose sum is σ = 83897130240. Its totient is φ = 6391554048.

The previous prime is 25291017083. The next prime is 25291017121. The reversal of 25291017120 is 2171019252.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (25291017121) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1192852 + ... + 1213868.

It is an arithmetic number, because the mean of its divisors is an integer number (436964220).

Almost surely, 2^25291017120 is an apocalyptic number.

25291017120 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 25291017120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41948565120).

25291017120 is an abundant number, since it is smaller than the sum of its proper divisors (58606113120).

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

25291017120 is a wasteful number, since it uses less digits than its factorization.

25291017120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21167 (or 21159 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 30.

The spelling of 25291017120 in words is "twenty-five billion, two hundred ninety-one million, seventeen thousand, one hundred twenty".