1660375990 has 192 divisors, whose sum is σ = 3984422400. Its totient is φ = 486300672.

The previous prime is 1660375931. The next prime is 1660375993. The reversal of 1660375990 is 995730661.

It is a self number, because there is not a number n which added to its sum of digits gives 1660375990.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1660375993) 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 95 ways as a sum of consecutive naturals, for example, 18655866 + ... + 18655954.

It is an arithmetic number, because the mean of its divisors is an integer number (20752200).

Almost surely, 2^1660375990 is an apocalyptic number.

1660375990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1660375990 is an abundant number, since it is smaller than the sum of its proper divisors (2324046410).

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

1660375990 is a wasteful number, since it uses less digits than its factorization.

1660375990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 231 (or 218 counting only the distinct ones).

The product of its (nonzero) digits is 306180, while the sum is 46.

The square root of 1660375990 is about 40747.7114694801. The cubic root of 1660375990 is about 1184.1375364295.

The spelling of 1660375990 in words is "one billion, six hundred sixty million, three hundred seventy-five thousand, nine hundred ninety".