16774437481 has 4 divisors (see below), whose sum is σ = 16795485252. Its totient is φ = 16753389712.

The previous prime is 16774437473. The next prime is 16774437541. The reversal of 16774437481 is 18473447761.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18473447761 = 619 ⋅29844019.

It can be written as a sum of positive squares in 2 ways, for example, as 10583265625 + 6191171856 = 102875^2 + 78684^2 .

It is a cyclic number.

It is not a de Polignac number, because 16774437481 - 2³ = 16774437473 is a prime.

It is a super-2 number, since 2×16774437481² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16774437431) 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, 10522690 + ... + 10524283.

It is an arithmetic number, because the mean of its divisors is an integer number (4198871313).

Almost surely, 2^16774437481 is an apocalyptic number.

It is an amenable number.

16774437481 is a deficient number, since it is larger than the sum of its proper divisors (21047771).

16774437481 is an equidigital number, since it uses as much as digits as its factorization.

16774437481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21047770.

The product of its digits is 3161088, while the sum is 52.

The spelling of 16774437481 in words is "sixteen billion, seven hundred seventy-four million, four hundred thirty-seven thousand, four hundred eighty-one".