1683640266857 has 4 divisors (see below), whose sum is σ = 1683656872080. Its totient is φ = 1683623661636.

The previous prime is 1683640266829. The next prime is 1683640266871. The reversal of 1683640266857 is 7586620463861.

It is a happy number.

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 a cyclic number.

It is not a de Polignac number, because 1683640266857 - 2³⁰ = 1682566525033 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1683640266857.

It is not an unprimeable number, because it can be changed into a prime (1683640266817) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8149583 + ... + 8353620.

It is an arithmetic number, because the mean of its divisors is an integer number (420914218020).

Almost surely, 2^{1683640266857} is an apocalyptic number.

It is an amenable number.

1683640266857 is a deficient number, since it is larger than the sum of its proper divisors (16605223).

1683640266857 is a wasteful number, since it uses less digits than its factorization.

1683640266857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16605222.

The product of its (nonzero) digits is 69672960, while the sum is 62.

The spelling of 1683640266857 in words is "one trillion, six hundred eighty-three billion, six hundred forty million, two hundred sixty-six thousand, eight hundred fifty-seven".