25641604445 has 16 divisors (see below), whose sum is σ = 31012156800. Its totient is φ = 20352114624.

The previous prime is 25641604369. The next prime is 25641604477. The reversal of 25641604445 is 54440614652.

It is a cyclic number.

It is not a de Polignac number, because 25641604445 - 2¹² = 25641600349 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 641414 + ... + 680216.

It is an arithmetic number, because the mean of its divisors is an integer number (1938259800).

Almost surely, 2^25641604445 is an apocalyptic number.

It is an amenable number.

25641604445 is a deficient number, since it is larger than the sum of its proper divisors (5370552355).

25641604445 is a wasteful number, since it uses less digits than its factorization.

25641604445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39844.

The product of its (nonzero) digits is 460800, while the sum is 41.

The spelling of 25641604445 in words is "twenty-five billion, six hundred forty-one million, six hundred four thousand, four hundred forty-five".