16745297517 has 48 divisors (see below), whose sum is σ = 27608621040. Its totient is φ = 9688743936.

The previous prime is 16745297473. The next prime is 16745297587. The reversal of 16745297517 is 71579254761.

16745297517 is a `hidden beast` number, since 1 + 6 + 74 + 52 + 9 + 7 + 517 = 666.

It can be written as a sum of positive squares in 8 ways, for example, as 2473172361 + 14272125156 = 49731^2 + 119466^2 .

It is not a de Polignac number, because 16745297517 - 2¹⁵ = 16745264749 is a prime.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16745297587) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2241853 + ... + 2249309.

It is an arithmetic number, because the mean of its divisors is an integer number (575179605).

Almost surely, 2^16745297517 is an apocalyptic number.

16745297517 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

16745297517 is a deficient number, since it is larger than the sum of its proper divisors (10863323523).

16745297517 is a wasteful number, since it uses less digits than its factorization.

16745297517 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8622 (or 8619 counting only the distinct ones).

The product of its digits is 3704400, while the sum is 54.

The spelling of 16745297517 in words is "sixteen billion, seven hundred forty-five million, two hundred ninety-seven thousand, five hundred seventeen".