105688727999 has 4 divisors (see below), whose sum is σ = 105691118520. Its totient is φ = 105686337480.

The previous prime is 105688727987. The next prime is 105688728011. The reversal of 105688727999 is 999727886501.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 999727886501 = 2797 ⋅357428633.

It is an interprime number because it is at equal distance from previous prime (105688727987) and next prime (105688728011).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-105688727999 is a prime.

It is a super-2 number, since 2×105688727999² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (105688727929) 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, 1127669 + ... + 1217790.

It is an arithmetic number, because the mean of its divisors is an integer number (26422779630).

Almost surely, 2^105688727999 is an apocalyptic number.

105688727999 is a deficient number, since it is larger than the sum of its proper divisors (2390521).

105688727999 is an equidigital number, since it uses as much as digits as its factorization.

105688727999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2390520.

The product of its (nonzero) digits is 137168640, while the sum is 71.

The spelling of 105688727999 in words is "one hundred five billion, six hundred eighty-eight million, seven hundred twenty-seven thousand, nine hundred ninety-nine".