166663810 has 8 divisors (see below), whose sum is σ = 299994876. Its totient is φ = 66665520.

The previous prime is 166663793. The next prime is 166663817. The reversal of 166663810 is 18366661.

It is a happy number.

166663810 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 141633801 + 25030009 = 11901^2 + 5003^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×166663810² = 55553651127432200, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 166663810.

It is not an unprimeable number, because it can be changed into a prime (166663817) 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, 8333181 + ... + 8333200.

Almost surely, 2^166663810 is an apocalyptic number.

166663810 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

166663810 is a deficient number, since it is larger than the sum of its proper divisors (133331066).

166663810 is a wasteful number, since it uses less digits than its factorization.

166663810 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16666388.

The product of its (nonzero) digits is 31104, while the sum is 37.

The square root of 166663810 is about 12909.8338486597. The cubic root of 166663810 is about 550.3180639626.

The spelling of 166663810 in words is "one hundred sixty-six million, six hundred sixty-three thousand, eight hundred ten".