66820367 has 2 divisors, whose sum is σ = 66820368. Its totient is φ = 66820366.

The previous prime is 66820363. The next prime is 66820393. The reversal of 66820367 is 76302866.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66820367 - 2² = 66820363 is a prime.

It is a super-2 number, since 2×66820367² = 8929922892029378, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 66820367.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66820361) 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 as a sum of consecutive naturals, namely, 33410183 + 33410184.

It is an arithmetic number, because the mean of its divisors is an integer number (33410184).

Almost surely, 2^66820367 is an apocalyptic number.

66820367 is a deficient number, since it is larger than the sum of its proper divisors (1).

66820367 is an equidigital number, since it uses as much as digits as its factorization.

66820367 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72576, while the sum is 38.

The square root of 66820367 is about 8174.3725753112. The cubic root of 66820367 is about 405.7915060281.

The spelling of 66820367 in words is "sixty-six million, eight hundred twenty thousand, three hundred sixty-seven".