25687445697 has 12 divisors (see below), whose sum is σ = 37238041620. Its totient is φ = 17063139168.

The previous prime is 25687445677. The next prime is 25687445837. The reversal of 25687445697 is 79654478652.

25687445697 is a `hidden beast` number, since 2 + 5 + 68 + 7 + 4 + 4 + 569 + 7 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 5352970896 + 20334474801 = 73164^2 + 142599^2 .

It is not a de Polignac number, because 25687445697 - 2⁷ = 25687445569 is a prime.

It is not an unprimeable number, because it can be changed into a prime (25687445677) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5149422 + ... + 5154407.

It is an arithmetic number, because the mean of its divisors is an integer number (3103170135).

Almost surely, 2^25687445697 is an apocalyptic number.

It is an amenable number.

25687445697 is a deficient number, since it is larger than the sum of its proper divisors (11550595923).

25687445697 is a wasteful number, since it uses less digits than its factorization.

25687445697 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10304112 (or 10304109 counting only the distinct ones).

The product of its digits is 101606400, while the sum is 63.

The spelling of 25687445697 in words is "twenty-five billion, six hundred eighty-seven million, four hundred forty-five thousand, six hundred ninety-seven".