25840655644 has 12 divisors (see below), whose sum is σ = 45223996104. Its totient is φ = 12919513904.

The previous prime is 25840655629. The next prime is 25840655657. The reversal of 25840655644 is 44655604852.

It is a happy number.

It is a super-2 number, since 2×25840655644² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 129019 + ... + 261394.

It is an arithmetic number, because the mean of its divisors is an integer number (3768666342).

Almost surely, 2^25840655644 is an apocalyptic number.

It is an amenable number.

25840655644 is a deficient number, since it is larger than the sum of its proper divisors (19383340460).

25840655644 is a wasteful number, since it uses less digits than its factorization.

25840655644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 406964 (or 406962 counting only the distinct ones).

The product of its (nonzero) digits is 4608000, while the sum is 49.

The spelling of 25840655644 in words is "twenty-five billion, eight hundred forty million, six hundred fifty-five thousand, six hundred forty-four".