166065623 has 4 divisors (see below), whose sum is σ = 166091520. Its totient is φ = 166039728.

The previous prime is 166065619. The next prime is 166065637. The reversal of 166065623 is 326560661.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 166065623 - 2² = 166065619 is a prime.

It is a super-2 number, since 2×166065623² = 55155582284756258, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166065323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4586 + ... + 18792.

It is an arithmetic number, because the mean of its divisors is an integer number (41522880).

Almost surely, 2^166065623 is an apocalyptic number.

166065623 is a deficient number, since it is larger than the sum of its proper divisors (25897).

166065623 is a wasteful number, since it uses less digits than its factorization.

166065623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25896.

The product of its (nonzero) digits is 38880, while the sum is 35.

The square root of 166065623 is about 12886.6451413857. The cubic root of 166065623 is about 549.6588771766.

The spelling of 166065623 in words is "one hundred sixty-six million, sixty-five thousand, six hundred twenty-three".