1660559994 has 16 divisors (see below), whose sum is σ = 3690133440. Its totient is φ = 553519980.

The previous prime is 1660559993. The next prime is 1660560019. The reversal of 1660559994 is 4999550661.

It is a Harshad number since it is a multiple of its sum of digits (54), and also a Moran number because the ratio is a prime number: 30751111 = 1660559994 / (1 + 6 + 6 + 0 + 5 + 5 + 9 + 9 + 9 + 4).

It is a self number, because there is not a number n which added to its sum of digits gives 1660559994.

It is not an unprimeable number, because it can be changed into a prime (1660559993) 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, 15375502 + ... + 15375609.

It is an arithmetic number, because the mean of its divisors is an integer number (230633340).

Almost surely, 2^1660559994 is an apocalyptic number.

1660559994 is an abundant number, since it is smaller than the sum of its proper divisors (2029573446).

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

1660559994 is a wasteful number, since it uses less digits than its factorization.

1660559994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30751122 (or 30751116 counting only the distinct ones).

The product of its (nonzero) digits is 2624400, while the sum is 54.

The square root of 1660559994 is about 40749.9692515221. The cubic root of 1660559994 is about 1184.1812771237.

The spelling of 1660559994 in words is "one billion, six hundred sixty million, five hundred fifty-nine thousand, nine hundred ninety-four".