66802775 has 48 divisors (see below), whose sum is σ = 96181344. Its totient is φ = 45588480.

The previous prime is 66802763. The next prime is 66802829. The reversal of 66802775 is 57720866.

It is a happy number.

It is not a de Polignac number, because 66802775 - 2⁴ = 66802759 is a prime.

It is a super-2 number, since 2×66802775² = 8925221495401250, which contains 22 as substring.

It is a Duffinian 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 47 ways as a sum of consecutive naturals, for example, 591119 + ... + 591231.

It is an arithmetic number, because the mean of its divisors is an integer number (2003778).

Almost surely, 2^66802775 is an apocalyptic number.

66802775 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

66802775 is a deficient number, since it is larger than the sum of its proper divisors (29378569).

66802775 is a wasteful number, since it uses less digits than its factorization.

66802775 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 260 (or 255 counting only the distinct ones).

The product of its (nonzero) digits is 141120, while the sum is 41.

The square root of 66802775 is about 8173.2964585900. The cubic root of 66802775 is about 405.7558915836.

The spelling of 66802775 in words is "sixty-six million, eight hundred two thousand, seven hundred seventy-five".