125520717849 has 32 divisors (see below), whose sum is σ = 177244354560. Its totient is φ = 78793041600.

The previous prime is 125520717827. The next prime is 125520717851. The reversal of 125520717849 is 948717025521.

It is a happy number.

It is not a de Polignac number, because 125520717849 - 2²⁷ = 125386500121 is a prime.

It is not an unprimeable number, because it can be changed into a prime (125520717349) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 35148234 + ... + 35151804.

It is an arithmetic number, because the mean of its divisors is an integer number (5538886080).

Almost surely, 2^125520717849 is an apocalyptic number.

125520717849 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

125520717849 is a deficient number, since it is larger than the sum of its proper divisors (51723636711).

125520717849 is a wasteful number, since it uses less digits than its factorization.

125520717849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7181.

The product of its (nonzero) digits is 1411200, while the sum is 51.

The spelling of 125520717849 in words is "one hundred twenty-five billion, five hundred twenty million, seven hundred seventeen thousand, eight hundred forty-nine".