1566611016217 has 4 divisors (see below), whose sum is σ = 1687119555940. Its totient is φ = 1446102476496.

The previous prime is 1566611016203. The next prime is 1566611016253. The reversal of 1566611016217 is 7126101166651.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 588640338441 + 977970677776 = 767229^2 + 988924^2 .

It is a cyclic number.

It is not a de Polignac number, because 1566611016217 - 2³⁵ = 1532251277849 is a prime.

It is a super-2 number, since 2×1566611016217² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1566611013217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 60254269842 + ... + 60254269867.

It is an arithmetic number, because the mean of its divisors is an integer number (421779888985).

Almost surely, 2^{1566611016217} is an apocalyptic number.

It is an amenable number.

1566611016217 is a deficient number, since it is larger than the sum of its proper divisors (120508539723).

1566611016217 is a wasteful number, since it uses less digits than its factorization.

1566611016217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120508539722.

The product of its (nonzero) digits is 90720, while the sum is 43.

The spelling of 1566611016217 in words is "one trillion, five hundred sixty-six billion, six hundred eleven million, sixteen thousand, two hundred seventeen".