166115563 has 4 divisors (see below), whose sum is σ = 167982120. Its totient is φ = 164249008.

The previous prime is 166115557. The next prime is 166115569. The reversal of 166115563 is 365511661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 365511661 = 641 ⋅570221.

It is an interprime number because it is at equal distance from previous prime (166115557) and next prime (166115569).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166115563 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166115569) 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, 933145 + ... + 933322.

It is an arithmetic number, because the mean of its divisors is an integer number (41995530).

Almost surely, 2^166115563 is an apocalyptic number.

166115563 is a deficient number, since it is larger than the sum of its proper divisors (1866557).

166115563 is an equidigital number, since it uses as much as digits as its factorization.

166115563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1866556.

The product of its digits is 16200, while the sum is 34.

The square root of 166115563 is about 12888.5826606342. The cubic root of 166115563 is about 549.7139702831.

The spelling of 166115563 in words is "one hundred sixty-six million, one hundred fifteen thousand, five hundred sixty-three".