16868636731 has 2 divisors, whose sum is σ = 16868636732. Its totient is φ = 16868636730.

The previous prime is 16868636669. The next prime is 16868636779. The reversal of 16868636731 is 13763686861.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 16868636731 - 2¹¹ = 16868634683 is a prime.

It is a super-2 number, since 2×16868636731² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (16868636131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8434318365 + 8434318366.

It is an arithmetic number, because the mean of its divisors is an integer number (8434318366).

Almost surely, 2^16868636731 is an apocalyptic number.

16868636731 is a deficient number, since it is larger than the sum of its proper divisors (1).

16868636731 is an equidigital number, since it uses as much as digits as its factorization.

16868636731 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5225472, while the sum is 55.

The spelling of 16868636731 in words is "sixteen billion, eight hundred sixty-eight million, six hundred thirty-six thousand, seven hundred thirty-one".