16540374517 has 2 divisors, whose sum is σ = 16540374518. Its totient is φ = 16540374516.

The previous prime is 16540374503. The next prime is 16540374523. The reversal of 16540374517 is 71547304561.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16427292561 + 113081956 = 128169^2 + 10634^2 .

It is a cyclic number.

It is not a de Polignac number, because 16540374517 - 2¹¹ = 16540372469 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16540374577) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8270187258 + 8270187259.

It is an arithmetic number, because the mean of its divisors is an integer number (8270187259).

Almost surely, 2^16540374517 is an apocalyptic number.

It is an amenable number.

16540374517 is a deficient number, since it is larger than the sum of its proper divisors (1).

16540374517 is an equidigital number, since it uses as much as digits as its factorization.

16540374517 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 352800, while the sum is 43.

The spelling of 16540374517 in words is "sixteen billion, five hundred forty million, three hundred seventy-four thousand, five hundred seventeen".