66785051 has 4 divisors (see below), whose sum is σ = 66801672. Its totient is φ = 66768432.

The previous prime is 66785041. The next prime is 66785071. The reversal of 66785051 is 15058766.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 66785051 - 2⁶ = 66784987 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66784996 and 66785014.

It is not an unprimeable number, because it can be changed into a prime (66785011) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 1895 + ... + 11711.

It is an arithmetic number, because the mean of its divisors is an integer number (16700418).

Almost surely, 2^66785051 is an apocalyptic number.

66785051 is a deficient number, since it is larger than the sum of its proper divisors (16621).

66785051 is an equidigital number, since it uses as much as digits as its factorization.

66785051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16620.

The product of its (nonzero) digits is 50400, while the sum is 38.

The square root of 66785051 is about 8172.2121240213. The cubic root of 66785051 is about 405.7200035858.

The spelling of 66785051 in words is "sixty-six million, seven hundred eighty-five thousand, fifty-one".