1686626013 has 4 divisors (see below), whose sum is σ = 2248834688. Its totient is φ = 1124417340.

The previous prime is 1686626003. The next prime is 1686626033. The reversal of 1686626013 is 3106266861.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 1686626013 - 2¹⁴ = 1686609629 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1686626003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 281104333 + ... + 281104338.

It is an arithmetic number, because the mean of its divisors is an integer number (562208672).

Almost surely, 2^1686626013 is an apocalyptic number.

It is an amenable number.

1686626013 is a deficient number, since it is larger than the sum of its proper divisors (562208675).

1686626013 is an equidigital number, since it uses as much as digits as its factorization.

1686626013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 562208674.

The product of its (nonzero) digits is 62208, while the sum is 39.

The square root of 1686626013 is about 41068.5526041520. The cubic root of 1686626013 is about 1190.3452174996.

The spelling of 1686626013 in words is "one billion, six hundred eighty-six million, six hundred twenty-six thousand, thirteen".