66817086 has 32 divisors (see below), whose sum is σ = 155846400. Its totient is φ = 19090008.

The previous prime is 66817067. The next prime is 66817111. The reversal of 66817086 is 68071866.

It is a Harshad number since it is a multiple of its sum of digits (42).

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 15 ways as a sum of consecutive naturals, for example, 14176 + ... + 18291.

It is an arithmetic number, because the mean of its divisors is an integer number (4870200).

Almost surely, 2^66817086 is an apocalyptic number.

66817086 is an abundant number, since it is smaller than the sum of its proper divisors (89029314).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66817086 is a wasteful number, since it uses less digits than its factorization.

66817086 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32493 (or 32479 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 42.

The square root of 66817086 is about 8174.1718846621. The cubic root of 66817086 is about 405.7848642222.

The spelling of 66817086 in words is "sixty-six million, eight hundred seventeen thousand, eighty-six".