166640366 has 4 divisors (see below), whose sum is σ = 249960552. Its totient is φ = 83320182.

The previous prime is 166640363. The next prime is 166640377. The reversal of 166640366 is 663046661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 663046661 = 59 ⋅11238079.

It is a super-2 number, since 2×166640366² = 55538023161227912, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166640363) 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 as a sum of consecutive naturals, namely, 41660090 + ... + 41660093.

It is an arithmetic number, because the mean of its divisors is an integer number (62490138).

Almost surely, 2^166640366 is an apocalyptic number.

166640366 is a deficient number, since it is larger than the sum of its proper divisors (83320186).

166640366 is an equidigital number, since it uses as much as digits as its factorization.

166640366 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83320185.

The product of its (nonzero) digits is 93312, while the sum is 38.

The square root of 166640366 is about 12908.9258267293. The cubic root of 166640366 is about 550.2922589970.

The spelling of 166640366 in words is "one hundred sixty-six million, six hundred forty thousand, three hundred sixty-six".