25747827561 has 32 divisors (see below), whose sum is σ = 40186368000. Its totient is φ = 16248093264.

The previous prime is 25747827559. The next prime is 25747827577. The reversal of 25747827561 is 16572874752.

25747827561 is a `hidden beast` number, since 2 + 5 + 7 + 4 + 78 + 2 + 7 + 561 = 666.

It is not a de Polignac number, because 25747827561 - 2¹ = 25747827559 is a prime.

It is a super-2 number, since 2×25747827561² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 25747827498 and 25747827507.

It is not an unprimeable number, because it can be changed into a prime (25747822561) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 606880 + ... + 647918.

It is an arithmetic number, because the mean of its divisors is an integer number (1255824000).

Almost surely, 2^25747827561 is an apocalyptic number.

It is an amenable number.

25747827561 is a deficient number, since it is larger than the sum of its proper divisors (14438540439).

25747827561 is a wasteful number, since it uses less digits than its factorization.

25747827561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42290 (or 42284 counting only the distinct ones).

The product of its digits is 6585600, while the sum is 54.

The spelling of 25747827561 in words is "twenty-five billion, seven hundred forty-seven million, eight hundred twenty-seven thousand, five hundred sixty-one".