1667899806 has 16 divisors (see below), whose sum is σ = 3368187264. Its totient is φ = 550568664.

The previous prime is 1667899777. The next prime is 1667899811. The reversal of 1667899806 is 6089987661.

It is a self number, because there is not a number n which added to its sum of digits gives 1667899806.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1348816 + ... + 1350051.

It is an arithmetic number, because the mean of its divisors is an integer number (210511704).

Almost surely, 2^1667899806 is an apocalyptic number.

1667899806 is an abundant number, since it is smaller than the sum of its proper divisors (1700287458).

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

1667899806 is a wasteful number, since it uses less digits than its factorization.

1667899806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2698975.

The product of its (nonzero) digits is 7838208, while the sum is 60.

The square root of 1667899806 is about 40839.9290645809. The cubic root of 1667899806 is about 1185.9234390792.

The spelling of 1667899806 in words is "one billion, six hundred sixty-seven million, eight hundred ninety-nine thousand, eight hundred six".