16774344581 has 2 divisors, whose sum is σ = 16774344582. Its totient is φ = 16774344580.

The previous prime is 16774344487. The next prime is 16774344607. The reversal of 16774344581 is 18544347761.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14128888225 + 2645456356 = 118865^2 + 51434^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16774344581 is a prime.

It is a super-2 number, since 2×16774344581² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16774344781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8387172290 + 8387172291.

It is an arithmetic number, because the mean of its divisors is an integer number (8387172291).

Almost surely, 2^16774344581 is an apocalyptic number.

It is an amenable number.

16774344581 is a deficient number, since it is larger than the sum of its proper divisors (1).

16774344581 is an equidigital number, since it uses as much as digits as its factorization.

16774344581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2257920, while the sum is 50.

The spelling of 16774344581 in words is "sixteen billion, seven hundred seventy-four million, three hundred forty-four thousand, five hundred eighty-one".