125850645681 has 4 divisors (see below), whose sum is σ = 167800860912. Its totient is φ = 83900430452.

The previous prime is 125850645677. The next prime is 125850645691. The reversal of 125850645681 is 186546058521.

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 125850645681 - 2² = 125850645677 is a prime.

It is a super-2 number, since 2×125850645681² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (125850645691) 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, 20975107611 + ... + 20975107616.

It is an arithmetic number, because the mean of its divisors is an integer number (41950215228).

Almost surely, 2^125850645681 is an apocalyptic number.

It is an amenable number.

125850645681 is a deficient number, since it is larger than the sum of its proper divisors (41950215231).

125850645681 is an equidigital number, since it uses as much as digits as its factorization.

125850645681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41950215230.

The product of its (nonzero) digits is 2304000, while the sum is 51.

The spelling of 125850645681 in words is "one hundred twenty-five billion, eight hundred fifty million, six hundred forty-five thousand, six hundred eighty-one".