1686883871837 has 4 divisors (see below), whose sum is σ = 1708236832320. Its totient is φ = 1665530911356.

The previous prime is 1686883871831. The next prime is 1686883871861. The reversal of 1686883871837 is 7381783886861.

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 1686883871837 - 2⁴ = 1686883871821 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1686883871831) 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, 10676480123 + ... + 10676480280.

It is an arithmetic number, because the mean of its divisors is an integer number (427059208080).

Almost surely, 2^{1686883871837} is an apocalyptic number.

It is an amenable number.

1686883871837 is a deficient number, since it is larger than the sum of its proper divisors (21352960483).

1686883871837 is an equidigital number, since it uses as much as digits as its factorization.

1686883871837 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21352960482.

The product of its digits is 520224768, while the sum is 74.

The spelling of 1686883871837 in words is "one trillion, six hundred eighty-six billion, eight hundred eighty-three million, eight hundred seventy-one thousand, eight hundred thirty-seven".