66985190 has 16 divisors (see below), whose sum is σ = 120702528. Its totient is φ = 26765376.

The previous prime is 66985189. The next prime is 66985211. The reversal of 66985190 is 9158966.

It is a super-2 number, since 2×66985190² = 8974031358672200, which contains 22 as substring.

It is a Curzon number.

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, 7994 + ... + 14066.

It is an arithmetic number, because the mean of its divisors is an integer number (7543908).

Almost surely, 2^66985190 is an apocalyptic number.

66985190 is a deficient number, since it is larger than the sum of its proper divisors (53717338).

66985190 is a wasteful number, since it uses less digits than its factorization.

66985190 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7183.

The product of its (nonzero) digits is 116640, while the sum is 44.

The square root of 66985190 is about 8184.4480571386. The cubic root of 66985190 is about 406.1248817063.

The spelling of 66985190 in words is "sixty-six million, nine hundred eighty-five thousand, one hundred ninety".