25706475661 has 8 divisors (see below), whose sum is σ = 26228644344. Its totient is φ = 25189555200.

The previous prime is 25706475653. The next prime is 25706475667. The reversal of 25706475661 is 16657460752.

It can be written as a sum of positive squares in 4 ways, for example, as 10532916900 + 15173558761 = 102630^2 + 123181^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 25706475661 - 2³ = 25706475653 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25706475667) by changing a digit.

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, 1302160 + ... + 1321753.

It is an arithmetic number, because the mean of its divisors is an integer number (3278580543).

Almost surely, 2^25706475661 is an apocalyptic number.

It is an amenable number.

25706475661 is a deficient number, since it is larger than the sum of its proper divisors (522168683).

25706475661 is a wasteful number, since it uses less digits than its factorization.

25706475661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2624111.

The product of its (nonzero) digits is 2116800, while the sum is 49.

The spelling of 25706475661 in words is "twenty-five billion, seven hundred six million, four hundred seventy-five thousand, six hundred sixty-one".