25640355000 has 160 divisors (see below), whose sum is σ = 86262699600. Its totient is φ = 6311424000.

The previous prime is 25640354939. The next prime is 25640355007. The reversal of 25640355000 is 55304652.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25640355007) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 129256 + ... + 260744.

Almost surely, 2^25640355000 is an apocalyptic number.

25640355000 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 25640355000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43131349800).

25640355000 is an abundant number, since it is smaller than the sum of its proper divisors (60622344600).

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

25640355000 is a wasteful number, since it uses less digits than its factorization.

25640355000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131531 (or 131512 counting only the distinct ones).

The product of its (nonzero) digits is 18000, while the sum is 30.

Adding to 25640355000 its reverse (55304652), we get a palindrome (25695659652).

The spelling of 25640355000 in words is "twenty-five billion, six hundred forty million, three hundred fifty-five thousand".