66900985 has 8 divisors (see below), whose sum is σ = 81642240. Its totient is φ = 52613424.

The previous prime is 66900979. The next prime is 66900989. The reversal of 66900985 is 58900966.

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

It is a cyclic number.

It is not a de Polignac number, because 66900985 - 2²⁵ = 33346553 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66900989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 113097 + ... + 113686.

It is an arithmetic number, because the mean of its divisors is an integer number (10205280).

Almost surely, 2^66900985 is an apocalyptic number.

It is an amenable number.

66900985 is a deficient number, since it is larger than the sum of its proper divisors (14741255).

66900985 is a wasteful number, since it uses less digits than its factorization.

66900985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 226847.

The product of its (nonzero) digits is 116640, while the sum is 43.

The square root of 66900985 is about 8179.3022318533. The cubic root of 66900985 is about 405.9546346944.

The spelling of 66900985 in words is "sixty-six million, nine hundred thousand, nine hundred eighty-five".