66855190 has 8 divisors (see below), whose sum is σ = 120339360. Its totient is φ = 26742072.

The previous prime is 66855163. The next prime is 66855193. The reversal of 66855190 is 9155866.

66855190 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a super-2 number, since 2×66855190² = 8939232859872200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66855193) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3342750 + ... + 3342769.

It is an arithmetic number, because the mean of its divisors is an integer number (15042420).

Almost surely, 2^66855190 is an apocalyptic number.

66855190 is a deficient number, since it is larger than the sum of its proper divisors (53484170).

66855190 is a wasteful number, since it uses less digits than its factorization.

66855190 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6685526.

The product of its (nonzero) digits is 64800, while the sum is 40.

The square root of 66855190 is about 8176.5023084446. The cubic root of 66855190 is about 405.8619856549.

The spelling of 66855190 in words is "sixty-six million, eight hundred fifty-five thousand, one hundred ninety".