8161966 has 4 divisors (see below), whose sum is σ = 12242952. Its totient is φ = 4080982.

The previous prime is 8161961. The next prime is 8161969. The reversal of 8161966 is 6691618.

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

It is a super-3 number, since 3×8161966³ (a number of 22 digits) contains 333 as substring.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8161961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2040490 + ... + 2040493.

It is an arithmetic number, because the mean of its divisors is an integer number (3060738).

Almost surely, 2^8161966 is an apocalyptic number.

8161966 is a deficient number, since it is larger than the sum of its proper divisors (4080986).

8161966 is a wasteful number, since it uses less digits than its factorization.

8161966 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4080985.

The product of its digits is 15552, while the sum is 37.

The square root of 8161966 is about 2856.9154695230. The cubic root of 8161966 is about 201.3407090798.

The spelling of 8161966 in words is "eight million, one hundred sixty-one thousand, nine hundred sixty-six".