166663366 has 4 divisors (see below), whose sum is σ = 249995052. Its totient is φ = 83331682.

The previous prime is 166663351. The next prime is 166663369. The reversal of 166663366 is 663366661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 663366661 = 179 ⋅3705959.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166663369) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41665840 + ... + 41665843.

It is an arithmetic number, because the mean of its divisors is an integer number (62498763).

Almost surely, 2^166663366 is an apocalyptic number.

166663366 is a deficient number, since it is larger than the sum of its proper divisors (83331686).

166663366 is an equidigital number, since it uses as much as digits as its factorization.

166663366 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83331685.

The product of its digits is 419904, while the sum is 43.

The square root of 166663366 is about 12909.8166524548. The cubic root of 166663366 is about 550.3175752714.

The spelling of 166663366 in words is "one hundred sixty-six million, six hundred sixty-three thousand, three hundred sixty-six".