16777371991 has 2 divisors, whose sum is σ = 16777371992. Its totient is φ = 16777371990.

The previous prime is 16777371973. The next prime is 16777372013. The reversal of 16777371991 is 19917377761.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 16777371991 - 2¹¹ = 16777369943 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16777371901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8388685995 + 8388685996.

It is an arithmetic number, because the mean of its divisors is an integer number (8388685996).

Almost surely, 2^16777371991 is an apocalyptic number.

16777371991 is a deficient number, since it is larger than the sum of its proper divisors (1).

16777371991 is an equidigital number, since it uses as much as digits as its factorization.

16777371991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3500658, while the sum is 58.

The spelling of 16777371991 in words is "sixteen billion, seven hundred seventy-seven million, three hundred seventy-one thousand, nine hundred ninety-one".