125665621224 has 128 divisors (see below), whose sum is σ = 369265236480. Its totient is φ = 35134329600.

The previous prime is 125665621199. The next prime is 125665621231. The reversal of 125665621224 is 422126566521.

It is a happy number.

It is a super-2 number, since 2×125665621224² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8266959 + ... + 8282145.

It is an arithmetic number, because the mean of its divisors is an integer number (2884884660).

Almost surely, 2^125665621224 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 125665621224, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (184632618240).

125665621224 is an abundant number, since it is smaller than the sum of its proper divisors (243599615256).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

125665621224 is a wasteful number, since it uses less digits than its factorization.

125665621224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17631 (or 17627 counting only the distinct ones).

The product of its digits is 345600, while the sum is 42.

The spelling of 125665621224 in words is "one hundred twenty-five billion, six hundred sixty-five million, six hundred twenty-one thousand, two hundred twenty-four".