125868576661 has 4 divisors (see below), whose sum is σ = 125870617312. Its totient is φ = 125866536012.

The previous prime is 125868576649. The next prime is 125868576667. The reversal of 125868576661 is 166675868521.

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 125868576661 - 2²¹ = 125866479509 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 125868576661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125868576667) 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, 924825 + ... + 1052158.

It is an arithmetic number, because the mean of its divisors is an integer number (31467654328).

Almost surely, 2^125868576661 is an apocalyptic number.

It is an amenable number.

125868576661 is a deficient number, since it is larger than the sum of its proper divisors (2040651).

125868576661 is an equidigital number, since it uses as much as digits as its factorization.

125868576661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2040650.

The product of its digits is 29030400, while the sum is 61.

The spelling of 125868576661 in words is "one hundred twenty-five billion, eight hundred sixty-eight million, five hundred seventy-six thousand, six hundred sixty-one".