25697784445 has 16 divisors (see below), whose sum is σ = 30963310848. Its totient is φ = 20474320320.

The previous prime is 25697784391. The next prime is 25697784479. The reversal of 25697784445 is 54448779652.

It is a de Polignac number, because none of the positive numbers 2^k-25697784445 is a prime.

It is a super-2 number, since 2×25697784445² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

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, 4909980 + ... + 4915210.

It is an arithmetic number, because the mean of its divisors is an integer number (1935206928).

Almost surely, 2^25697784445 is an apocalyptic number.

It is an amenable number.

25697784445 is a deficient number, since it is larger than the sum of its proper divisors (5265526403).

25697784445 is a wasteful number, since it uses less digits than its factorization.

25697784445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9060.

The product of its digits is 67737600, while the sum is 61.

The spelling of 25697784445 in words is "twenty-five billion, six hundred ninety-seven million, seven hundred eighty-four thousand, four hundred forty-five".