125921179867 has 16 divisors (see below), whose sum is σ = 146141049600. Its totient is φ = 106267973472.

The previous prime is 125921179817. The next prime is 125921179883. The reversal of 125921179867 is 768971129521.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-125921179867 is a prime.

It is a super-2 number, since 2×125921179867² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (125921179807) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 199617 + ... + 540082.

It is an arithmetic number, because the mean of its divisors is an integer number (9133815600).

Almost surely, 2^125921179867 is an apocalyptic number.

125921179867 is a deficient number, since it is larger than the sum of its proper divisors (20219869733).

125921179867 is an equidigital number, since it uses as much as digits as its factorization.

125921179867 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 740082.

The product of its digits is 3810240, while the sum is 58.

The spelling of 125921179867 in words is "one hundred twenty-five billion, nine hundred twenty-one million, one hundred seventy-nine thousand, eight hundred sixty-seven".