125440455521 has 8 divisors (see below), whose sum is σ = 130282992000. Its totient is φ = 120632386000.

The previous prime is 125440455431. The next prime is 125440455533. The reversal of 125440455521 is 125554044521.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-125440455521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (125440455121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8609321 + ... + 8623878.

It is an arithmetic number, because the mean of its divisors is an integer number (16285374000).

Almost surely, 2^125440455521 is an apocalyptic number.

It is an amenable number.

125440455521 is a deficient number, since it is larger than the sum of its proper divisors (4842536479).

125440455521 is a wasteful number, since it uses less digits than its factorization.

125440455521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17233479.

The product of its (nonzero) digits is 160000, while the sum is 38.

The spelling of 125440455521 in words is "one hundred twenty-five billion, four hundred forty million, four hundred fifty-five thousand, five hundred twenty-one".