1688315911499 has 4 divisors (see below), whose sum is σ = 1929503898864. Its totient is φ = 1447127924136.

The previous prime is 1688315911489. The next prime is 1688315911573. The reversal of 1688315911499 is 9941195138861.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1688315911499 - 2²⁸ = 1688047476043 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1688315911409) 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, 120593993672 + ... + 120593993685.

It is an arithmetic number, because the mean of its divisors is an integer number (482375974716).

Almost surely, 2^{1688315911499} is an apocalyptic number.

1688315911499 is a deficient number, since it is larger than the sum of its proper divisors (241187987365).

1688315911499 is an equidigital number, since it uses as much as digits as its factorization.

1688315911499 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 241187987364.

The product of its digits is 16796160, while the sum is 65.

The spelling of 1688315911499 in words is "one trillion, six hundred eighty-eight billion, three hundred fifteen million, nine hundred eleven thousand, four hundred ninety-nine".