125978337209 has 4 divisors (see below), whose sum is σ = 125984372304. Its totient is φ = 125972302116.

The previous prime is 125978337193. The next prime is 125978337269. The reversal of 125978337209 is 902733879521.

It is a happy number.

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 125978337209 - 2⁴ = 125978337193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (125978337269) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2986127 + ... + 3028020.

It is an arithmetic number, because the mean of its divisors is an integer number (31496093076).

Almost surely, 2^125978337209 is an apocalyptic number.

It is an amenable number.

125978337209 is a deficient number, since it is larger than the sum of its proper divisors (6035095).

125978337209 is an equidigital number, since it uses as much as digits as its factorization.

125978337209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6035094.

The product of its (nonzero) digits is 5715360, while the sum is 56.

The spelling of 125978337209 in words is "one hundred twenty-five billion, nine hundred seventy-eight million, three hundred thirty-seven thousand, two hundred nine".