660506121 has 24 divisors (see below), whose sum is σ = 1058447520. Its totient is φ = 393518400.

The previous prime is 660506107. The next prime is 660506141. The reversal of 660506121 is 121605066.

It is a happy number.

It is not a de Polignac number, because 660506121 - 2⁵ = 660506089 is a prime.

It is a super-3 number, since 3×660506121³ (a number of 27 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (660506141) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 50700 + ... + 62381.

It is an arithmetic number, because the mean of its divisors is an integer number (44101980).

Almost surely, 2^660506121 is an apocalyptic number.

It is an amenable number.

660506121 is a deficient number, since it is larger than the sum of its proper divisors (397941399).

660506121 is a wasteful number, since it uses less digits than its factorization.

660506121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113157 (or 113154 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 660506121 is about 25700.3136362185. The cubic root of 660506121 is about 870.8812671452.

The spelling of 660506121 in words is "six hundred sixty million, five hundred six thousand, one hundred twenty-one".