25821257560 has 48 divisors (see below), whose sum is σ = 67583194560. Its totient is φ = 8853001920.

The previous prime is 25821257513. The next prime is 25821257569. The reversal of 25821257560 is 6575212852.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25821257569) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6585096 + ... + 6589015.

It is an arithmetic number, because the mean of its divisors is an integer number (1407983220).

Almost surely, 2^25821257560 is an apocalyptic number.

25821257560 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25821257560 is an abundant number, since it is smaller than the sum of its proper divisors (41761937000).

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

25821257560 is a wasteful number, since it uses less digits than its factorization.

25821257560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13174136 (or 13174125 counting only the distinct ones).

The product of its (nonzero) digits is 336000, while the sum is 43.

The spelling of 25821257560 in words is "twenty-five billion, eight hundred twenty-one million, two hundred fifty-seven thousand, five hundred sixty".