125972607809 has 4 divisors (see below), whose sum is σ = 125978191920. Its totient is φ = 125967023700.

The previous prime is 125972607721. The next prime is 125972607823. The reversal of 125972607809 is 908706279521.

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 a de Polignac number, because none of the positive numbers 2^k-125972607809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (125972607869) 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, 2758079 + ... + 2803380.

It is an arithmetic number, because the mean of its divisors is an integer number (31494547980).

Almost surely, 2^125972607809 is an apocalyptic number.

It is an amenable number.

125972607809 is a deficient number, since it is larger than the sum of its proper divisors (5584111).

125972607809 is an equidigital number, since it uses as much as digits as its factorization.

125972607809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5584110.

The product of its (nonzero) digits is 3810240, while the sum is 56.

The spelling of 125972607809 in words is "one hundred twenty-five billion, nine hundred seventy-two million, six hundred seven thousand, eight hundred nine".