25556625840 has 80 divisors (see below), whose sum is σ = 81957477600. Its totient is φ = 6580094976.

The previous prime is 25556625833. The next prime is 25556625841. The reversal of 25556625840 is 4852665552.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×25556625840² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a self number, because there is not a number n which added to its sum of digits gives 25556625840.

It is not an unprimeable number, because it can be changed into a prime (25556625841) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1829005 + ... + 1842924.

It is an arithmetic number, because the mean of its divisors is an integer number (1024468470).

Almost surely, 2^25556625840 is an apocalyptic number.

25556625840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25556625840 is an abundant number, since it is smaller than the sum of its proper divisors (56400851760).

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

25556625840 is a wasteful number, since it uses less digits than its factorization.

25556625840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3671974 (or 3671968 counting only the distinct ones).

The product of its (nonzero) digits is 2880000, while the sum is 48.

The spelling of 25556625840 in words is "twenty-five billion, five hundred fifty-six million, six hundred twenty-five thousand, eight hundred forty".