1606216517 has 2 divisors, whose sum is σ = 1606216518. Its totient is φ = 1606216516.

The previous prime is 1606216511. The next prime is 1606216541. The reversal of 1606216517 is 7156126061.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1526543041 + 79673476 = 39071^2 + 8926^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1606216517 is a prime.

It is a super-2 number, since 2×1606216517² = 5159862998967222578, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1606216511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 803108258 + 803108259.

It is an arithmetic number, because the mean of its divisors is an integer number (803108259).

Almost surely, 2^1606216517 is an apocalyptic number.

It is an amenable number.

1606216517 is a deficient number, since it is larger than the sum of its proper divisors (1).

1606216517 is an equidigital number, since it uses as much as digits as its factorization.

1606216517 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15120, while the sum is 35.

The square root of 1606216517 is about 40077.6311300955. The cubic root of 1606216517 is about 1171.1199048869.

The spelling of 1606216517 in words is "one billion, six hundred six million, two hundred sixteen thousand, five hundred seventeen".