66790985 has 16 divisors (see below), whose sum is σ = 85532160. Its totient is φ = 49921920.

The previous prime is 66790979. The next prime is 66790993. The reversal of 66790985 is 58909766.

It is not a de Polignac number, because 66790985 - 2⁶ = 66790921 is a prime.

It is a super-2 number, since 2×66790985² = 8922071354540450, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2120 + ... + 11750.

It is an arithmetic number, because the mean of its divisors is an integer number (5345760).

Almost surely, 2^66790985 is an apocalyptic number.

It is an amenable number.

66790985 is a deficient number, since it is larger than the sum of its proper divisors (18741175).

66790985 is a wasteful number, since it uses less digits than its factorization.

66790985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9728.

The product of its (nonzero) digits is 816480, while the sum is 50.

The square root of 66790985 is about 8172.5751755490. The cubic root of 66790985 is about 405.7320196042.

The spelling of 66790985 in words is "sixty-six million, seven hundred ninety thousand, nine hundred eighty-five".