125021440561 has 16 divisors (see below), whose sum is σ = 141034780800. Its totient is φ = 110229787008.

The previous prime is 125021440501. The next prime is 125021440573. The reversal of 125021440561 is 165044120521.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 125021440561 - 2²⁵ = 124987886129 is a prime.

It is not an unprimeable number, because it can be changed into a prime (125021440501) 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, 3849916 + ... + 3882253.

It is an arithmetic number, because the mean of its divisors is an integer number (8814673800).

Almost surely, 2^125021440561 is an apocalyptic number.

It is an amenable number.

125021440561 is a deficient number, since it is larger than the sum of its proper divisors (16013340239).

125021440561 is a wasteful number, since it uses less digits than its factorization.

125021440561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7732248.

The product of its (nonzero) digits is 9600, while the sum is 31.

The spelling of 125021440561 in words is "one hundred twenty-five billion, twenty-one million, four hundred forty thousand, five hundred sixty-one".