1686990266 has 16 divisors (see below), whose sum is σ = 2733913728. Its totient is φ = 776103600.

The previous prime is 1686990251. The next prime is 1686990281. The reversal of 1686990266 is 6620996861.

It is an interprime number because it is at equal distance from previous prime (1686990251) and next prime (1686990281).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 96230 + ... + 112401.

It is an arithmetic number, because the mean of its divisors is an integer number (170869608).

Almost surely, 2^1686990266 is an apocalyptic number.

1686990266 is a deficient number, since it is larger than the sum of its proper divisors (1046923462).

1686990266 is a wasteful number, since it uses less digits than its factorization.

1686990266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 208957.

The product of its (nonzero) digits is 1679616, while the sum is 53.

The square root of 1686990266 is about 41072.9870596235. The cubic root of 1686990266 is about 1190.4309024912.

The spelling of 1686990266 in words is "one billion, six hundred eighty-six million, nine hundred ninety thousand, two hundred sixty-six".