25012642644 has 96 divisors (see below), whose sum is σ = 74466201600. Its totient is φ = 7180656480.

The previous prime is 25012642643. The next prime is 25012642687. The reversal of 25012642644 is 44624621052.

25012642644 is a `hidden beast` number, since 2 + 5 + 0 + 1 + 2 + 6 + 4 + 2 + 644 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 25012642599 and 25012642608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25012642643) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 531492 + ... + 576635.

It is an arithmetic number, because the mean of its divisors is an integer number (775689600).

Almost surely, 2^25012642644 is an apocalyptic number.

It is an amenable number.

25012642644 is an abundant number, since it is smaller than the sum of its proper divisors (49453558956).

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

25012642644 is a wasteful number, since it uses less digits than its factorization.

25012642644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1108170 (or 1108162 counting only the distinct ones).

The product of its (nonzero) digits is 92160, while the sum is 36.

The spelling of 25012642644 in words is "twenty-five billion, twelve million, six hundred forty-two thousand, six hundred forty-four".