25075567661 has 4 divisors (see below), whose sum is σ = 26395334400. Its totient is φ = 23755800924.

The previous prime is 25075567589. The next prime is 25075567667. The reversal of 25075567661 is 16676557052.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 25075567661 - 2²² = 25071373357 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25075567667) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 659883341 + ... + 659883378.

It is an arithmetic number, because the mean of its divisors is an integer number (6598833600).

Almost surely, 2^25075567661 is an apocalyptic number.

It is an amenable number.

25075567661 is a deficient number, since it is larger than the sum of its proper divisors (1319766739).

25075567661 is a wasteful number, since it uses less digits than its factorization.

25075567661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1319766738.

The product of its (nonzero) digits is 2646000, while the sum is 50.

The spelling of 25075567661 in words is "twenty-five billion, seventy-five million, five hundred sixty-seven thousand, six hundred sixty-one".