1686990265 has 8 divisors (see below), whose sum is σ = 2062584648. Its totient is φ = 1324128000.

The previous prime is 1686990251. The next prime is 1686990281. The reversal of 1686990265 is 5620996861.

It can be written as a sum of positive squares in 4 ways, for example, as 180929401 + 1506060864 = 13451^2 + 38808^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1686990265 - 2¹⁵ = 1686957497 is a prime.

It is a Duffinian number.

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, 3182736 + ... + 3183265.

It is an arithmetic number, because the mean of its divisors is an integer number (257823081).

Almost surely, 2^1686990265 is an apocalyptic number.

It is an amenable number.

1686990265 is a deficient number, since it is larger than the sum of its proper divisors (375594383).

1686990265 is an equidigital number, since it uses as much as digits as its factorization.

1686990265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6366059.

The product of its (nonzero) digits is 1399680, while the sum is 52.

The square root of 1686990265 is about 41072.9870474501. The cubic root of 1686990265 is about 1190.4309022560.

The spelling of 1686990265 in words is "one billion, six hundred eighty-six million, nine hundred ninety thousand, two hundred sixty-five".