660157121 has 8 divisors (see below), whose sum is σ = 733872384. Its totient is φ = 589718160.

The previous prime is 660157111. The next prime is 660157123. The reversal of 660157121 is 121751066.

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

It is a cyclic number.

It is not a de Polignac number, because 660157121 - 2²⁶ = 593048257 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (660157123) 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, 818651 + ... + 819456.

It is an arithmetic number, because the mean of its divisors is an integer number (91734048).

Almost surely, 2^660157121 is an apocalyptic number.

It is an amenable number.

660157121 is a deficient number, since it is larger than the sum of its proper divisors (73715263).

660157121 is a wasteful number, since it uses less digits than its factorization.

660157121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1638151.

The product of its (nonzero) digits is 2520, while the sum is 29.

The square root of 660157121 is about 25693.5229386707. The cubic root of 660157121 is about 870.7278539266.

The spelling of 660157121 in words is "six hundred sixty million, one hundred fifty-seven thousand, one hundred twenty-one".