125521660 has 24 divisors (see below), whose sum is σ = 287559216. Its totient is φ = 45644160.

The previous prime is 125521637. The next prime is 125521667. The reversal of 125521660 is 66125521.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125521667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 285057 + ... + 285496.

It is an arithmetic number, because the mean of its divisors is an integer number (11981634).

Almost surely, 2^125521660 is an apocalyptic number.

125521660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

125521660 is an abundant number, since it is smaller than the sum of its proper divisors (162037556).

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

125521660 is a wasteful number, since it uses less digits than its factorization.

125521660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 570573 (or 570571 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 28.

The square root of 125521660 is about 11203.6449426068. The cubic root of 125521660 is about 500.6945813334.

The spelling of 125521660 in words is "one hundred twenty-five million, five hundred twenty-one thousand, six hundred sixty".