125537918929 has 4 divisors (see below), whose sum is σ = 132145177840. Its totient is φ = 118930660020.

The previous prime is 125537918923. The next prime is 125537918951. The reversal of 125537918929 is 929819735521.

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, and also an emirpimes, since its reverse is a distinct semiprime: 929819735521 = 87881 ⋅10580441.

It is a cyclic number.

It is not a de Polignac number, because 125537918929 - 2³ = 125537918921 is a prime.

It is not an unprimeable number, because it can be changed into a prime (125537918921) 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, 3303629427 + ... + 3303629464.

It is an arithmetic number, because the mean of its divisors is an integer number (33036294460).

Almost surely, 2^125537918929 is an apocalyptic number.

125537918929 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

125537918929 is a deficient number, since it is larger than the sum of its proper divisors (6607258911).

125537918929 is an equidigital number, since it uses as much as digits as its factorization.

125537918929 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6607258910.

The product of its digits is 12247200, while the sum is 61.

The spelling of 125537918929 in words is "one hundred twenty-five billion, five hundred thirty-seven million, nine hundred eighteen thousand, nine hundred twenty-nine".