125815266621 has 12 divisors (see below), whose sum is σ = 198254359680. Its totient is φ = 76251676680.

The previous prime is 125815266613. The next prime is 125815266623. The reversal of 125815266621 is 126662518521.

It is not a de Polignac number, because 125815266621 - 2³ = 125815266613 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125815266623) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 635430541 + ... + 635430738.

It is an arithmetic number, because the mean of its divisors is an integer number (16521196640).

Almost surely, 2^125815266621 is an apocalyptic number.

125815266621 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

125815266621 is a deficient number, since it is larger than the sum of its proper divisors (72439093059).

125815266621 is a wasteful number, since it uses less digits than its factorization.

125815266621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1270861296 (or 1270861293 counting only the distinct ones).

The product of its digits is 345600, while the sum is 45.

The spelling of 125815266621 in words is "one hundred twenty-five billion, eight hundred fifteen million, two hundred sixty-six thousand, six hundred twenty-one".