25615570000 has 100 divisors (see below), whose sum is σ = 63531504036. Its totient is φ = 9996160000.

The previous prime is 25615569989. The next prime is 25615570003. The reversal of 25615570000 is 7551652.

It can be written as a sum of positive squares in 10 ways, for example, as 25560335376 + 55234624 = 159876^2 + 7432^2 .

It is a tau number, because it is divible by the number of its divisors (100).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25615570003) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 378762 + ... + 441238.

Almost surely, 2^25615570000 is an apocalyptic number.

25615570000 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 25615570000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31765752018).

25615570000 is an abundant number, since it is smaller than the sum of its proper divisors (37915934036).

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

25615570000 is an equidigital number, since it uses as much as digits as its factorization.

25615570000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62546 (or 62525 counting only the distinct ones).

The product of its (nonzero) digits is 10500, while the sum is 31.

The spelling of 25615570000 in words is "twenty-five billion, six hundred fifteen million, five hundred seventy thousand".