66749859 has 32 divisors (see below), whose sum is σ = 108345600. Its totient is φ = 40279680.

The previous prime is 66749857. The next prime is 66749873. The reversal of 66749859 is 95894766.

It is not a de Polignac number, because 66749859 - 2¹ = 66749857 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66749857) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 112267 + ... + 112859.

It is an arithmetic number, because the mean of its divisors is an integer number (3385800).

Almost surely, 2^66749859 is an apocalyptic number.

66749859 is a deficient number, since it is larger than the sum of its proper divisors (41595741).

66749859 is a wasteful number, since it uses less digits than its factorization.

66749859 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 992 (or 986 counting only the distinct ones).

The product of its digits is 3265920, while the sum is 54.

The square root of 66749859 is about 8170.0586901197. The cubic root of 66749859 is about 405.6487271209.

The spelling of 66749859 in words is "sixty-six million, seven hundred forty-nine thousand, eight hundred fifty-nine".