1668599880 has 64 divisors (see below), whose sum is σ = 5011070400. Its totient is φ = 444491520.

The previous prime is 1668599833. The next prime is 1668599899. The reversal of 1668599880 is 889958661.

It is a Harshad number since it is a multiple of its sum of digits (60).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 115711 + ... + 129329.

It is an arithmetic number, because the mean of its divisors is an integer number (78297975).

Almost surely, 2^1668599880 is an apocalyptic number.

1668599880 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1668599880 is an abundant number, since it is smaller than the sum of its proper divisors (3342470520).

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

1668599880 is a wasteful number, since it uses less digits than its factorization.

1668599880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14654 (or 14650 counting only the distinct ones).

The product of its (nonzero) digits is 7464960, while the sum is 60.

The square root of 1668599880 is about 40848.4991156346. The cubic root of 1668599880 is about 1186.0893399386.

The spelling of 1668599880 in words is "one billion, six hundred sixty-eight million, five hundred ninety-nine thousand, eight hundred eighty".