1660121199 has 12 divisors (see below), whose sum is σ = 2615948712. Its totient is φ = 1006134000.

The previous prime is 1660121159. The next prime is 1660121237. The reversal of 1660121199 is 9911210661.

1660121199 is a `hidden beast` number, since 16 + 601 + 21 + 19 + 9 = 666.

It is a de Polignac number, because none of the positive numbers 2^k-1660121199 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1660121129) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8384352 + ... + 8384549.

It is an arithmetic number, because the mean of its divisors is an integer number (217995726).

Almost surely, 2^1660121199 is an apocalyptic number.

1660121199 is a deficient number, since it is larger than the sum of its proper divisors (955827513).

1660121199 is a wasteful number, since it uses less digits than its factorization.

1660121199 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16768918 (or 16768915 counting only the distinct ones).

The product of its (nonzero) digits is 5832, while the sum is 36.

The square root of 1660121199 is about 40744.5849040090. The cubic root of 1660121199 is about 1184.0769631973.

The spelling of 1660121199 in words is "one billion, six hundred sixty million, one hundred twenty-one thousand, one hundred ninety-nine".