1686897643923 has 6 divisors (see below), whose sum is σ = 2436629930124. Its totient is φ = 1124598429276.

The previous prime is 1686897643913. The next prime is 1686897643939. The reversal of 1686897643923 is 3293467986861.

1686897643923 is a `hidden beast` number, since 1 + 6 + 86 + 8 + 97 + 6 + 439 + 23 = 666.

It is not a de Polignac number, because 1686897643923 - 2¹⁴ = 1686897627539 is a prime.

It is a super-2 number, since 2×1686897643923² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1686897643913) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 93716535765 + ... + 93716535782.

It is an arithmetic number, because the mean of its divisors is an integer number (406104988354).

Almost surely, 2^{1686897643923} is an apocalyptic number.

1686897643923 is a deficient number, since it is larger than the sum of its proper divisors (749732286201).

1686897643923 is a wasteful number, since it uses less digits than its factorization.

1686897643923 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 187433071553 (or 187433071550 counting only the distinct ones).

The product of its digits is 564350976, while the sum is 72.

The spelling of 1686897643923 in words is "one trillion, six hundred eighty-six billion, eight hundred ninety-seven million, six hundred forty-three thousand, nine hundred twenty-three".