166308623 has 4 divisors (see below), whose sum is σ = 179101608. Its totient is φ = 153515640.

The previous prime is 166308613. The next prime is 166308683. The reversal of 166308623 is 326803661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 326803661 = 41 ⋅7970821.

It is a cyclic number.

It is not a de Polignac number, because 166308623 - 2¹⁶ = 166243087 is a prime.

It is a super-2 number, since 2×166308623² = 55317116168312258, 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 (166308613) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6396473 + ... + 6396498.

It is an arithmetic number, because the mean of its divisors is an integer number (44775402).

Almost surely, 2^166308623 is an apocalyptic number.

166308623 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

166308623 is a deficient number, since it is larger than the sum of its proper divisors (12792985).

166308623 is a wasteful number, since it uses less digits than its factorization.

166308623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12792984.

The product of its (nonzero) digits is 31104, while the sum is 35.

The square root of 166308623 is about 12896.0700602936. The cubic root of 166308623 is about 549.9268475711.

The spelling of 166308623 in words is "one hundred sixty-six million, three hundred eight thousand, six hundred twenty-three".