16555266432517 has 2 divisors, whose sum is σ = 16555266432518. Its totient is φ = 16555266432516.

The previous prime is 16555266432511. The next prime is 16555266432527. The reversal of 16555266432517 is 71523466255561.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16386903109476 + 168363323041 = 4048074^2 + 410321^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16555266432517 is a prime.

It is a super-2 number, since 2×16555266432517² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16555266432511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8277633216258 + 8277633216259.

It is an arithmetic number, because the mean of its divisors is an integer number (8277633216259).

Almost surely, 2^{16555266432517} is an apocalyptic number.

It is an amenable number.

16555266432517 is a deficient number, since it is larger than the sum of its proper divisors (1).

16555266432517 is an equidigital number, since it uses as much as digits as its factorization.

16555266432517 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 45360000, while the sum is 58.

The spelling of 16555266432517 in words is "sixteen trillion, five hundred fifty-five billion, two hundred sixty-six million, four hundred thirty-two thousand, five hundred seventeen".