25582601640 has 64 divisors (see below), whose sum is σ = 81262388160. Its totient is φ = 6420730880.

The previous prime is 25582601593. The next prime is 25582601659. The reversal of 25582601640 is 4610628552.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6268206 + ... + 6272285.

It is an arithmetic number, because the mean of its divisors is an integer number (1269724815).

Almost surely, 2^25582601640 is an apocalyptic number.

25582601640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25582601640 is an abundant number, since it is smaller than the sum of its proper divisors (55679786520).

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

25582601640 is a wasteful number, since it uses less digits than its factorization.

25582601640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12540522 (or 12540518 counting only the distinct ones).

The product of its (nonzero) digits is 115200, while the sum is 39.

The spelling of 25582601640 in words is "twenty-five billion, five hundred eighty-two million, six hundred one thousand, six hundred forty".