66660190 has 16 divisors (see below), whose sum is σ = 121956480. Its totient is φ = 26226720.

The previous prime is 66660163. The next prime is 66660203. The reversal of 66660190 is 9106666.

It is a happy number.

It is a super-2 number, since 2×66660190² = 8887161861672200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 54030 + ... + 55249.

It is an arithmetic number, because the mean of its divisors is an integer number (7622280).

Almost surely, 2^66660190 is an apocalyptic number.

66660190 is a deficient number, since it is larger than the sum of its proper divisors (55296290).

66660190 is a wasteful number, since it uses less digits than its factorization.

66660190 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109347.

The product of its (nonzero) digits is 11664, while the sum is 34.

The square root of 66660190 is about 8164.5691864299. The cubic root of 66660190 is about 405.4670018147.

The spelling of 66660190 in words is "sixty-six million, six hundred sixty thousand, one hundred ninety".