816166139 has 4 divisors (see below), whose sum is σ = 833531424. Its totient is φ = 798800856.

The previous prime is 816166103. The next prime is 816166157. The reversal of 816166139 is 931661618.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-816166139 is a prime.

It is a super-2 number, since 2×816166139² = 1332254332900334642, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 816166096 and 816166105.

It is not an unprimeable number, because it can be changed into a prime (816166199) 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, 8682572 + ... + 8682665.

It is an arithmetic number, because the mean of its divisors is an integer number (208382856).

Almost surely, 2^816166139 is an apocalyptic number.

816166139 is a deficient number, since it is larger than the sum of its proper divisors (17365285).

816166139 is a wasteful number, since it uses less digits than its factorization.

816166139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17365284.

The product of its digits is 46656, while the sum is 41.

The square root of 816166139 is about 28568.6215803283. The cubic root of 816166139 is about 934.5291609771.

The spelling of 816166139 in words is "eight hundred sixteen million, one hundred sixty-six thousand, one hundred thirty-nine".