25641600646 has 16 divisors (see below), whose sum is σ = 40141026144. Its totient is φ = 12261434944.

The previous prime is 25641600587. The next prime is 25641600653. The reversal of 25641600646 is 64600614652.

It is a junction number, because it is equal to n+sod(n) for n = 25641600599 and 25641600608.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 274776 + ... + 356068.

It is an arithmetic number, because the mean of its divisors is an integer number (2508814134).

Almost surely, 2^25641600646 is an apocalyptic number.

25641600646 is a deficient number, since it is larger than the sum of its proper divisors (14499425498).

25641600646 is a wasteful number, since it uses less digits than its factorization.

25641600646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88175.

The product of its (nonzero) digits is 207360, while the sum is 40.

The spelling of 25641600646 in words is "twenty-five billion, six hundred forty-one million, six hundred thousand, six hundred forty-six".