1668840810 has 64 divisors (see below), whose sum is σ = 4929507072. Its totient is φ = 352106496.

The previous prime is 1668840799. The next prime is 1668840829. The reversal of 1668840810 is 180488661.

It is a super-2 number, since 2×1668840810² = 5570059298242912200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 302919 + ... + 308378.

It is an arithmetic number, because the mean of its divisors is an integer number (77023548).

Almost surely, 2^1668840810 is an apocalyptic number.

1668840810 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1668840810 is an abundant number, since it is smaller than the sum of its proper divisors (3260666262).

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

1668840810 is a wasteful number, since it uses less digits than its factorization.

1668840810 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 611327.

The product of its (nonzero) digits is 73728, while the sum is 42.

The square root of 1668840810 is about 40851.4480771490. The cubic root of 1668840810 is about 1186.1464238757.

The spelling of 1668840810 in words is "one billion, six hundred sixty-eight million, eight hundred forty thousand, eight hundred ten".