16778653538831 has 2 divisors, whose sum is σ = 16778653538832. Its totient is φ = 16778653538830.

The previous prime is 16778653538809. The next prime is 16778653538891. The reversal of 16778653538831 is 13883535687761.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16778653538831 is a prime.

It is a super-2 number, since 2×16778653538831² (a number of 27 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16778653538891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8389326769415 + 8389326769416.

It is an arithmetic number, because the mean of its divisors is an integer number (8389326769416).

Almost surely, 2^{16778653538831} is an apocalyptic number.

16778653538831 is a deficient number, since it is larger than the sum of its proper divisors (1).

16778653538831 is an equidigital number, since it uses as much as digits as its factorization.

16778653538831 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 609638400, while the sum is 71.

The spelling of 16778653538831 in words is "sixteen trillion, seven hundred seventy-eight billion, six hundred fifty-three million, five hundred thirty-eight thousand, eight hundred thirty-one".