66277823 has 2 divisors, whose sum is σ = 66277824. Its totient is φ = 66277822.

The previous prime is 66277819. The next prime is 66277837. The reversal of 66277823 is 32877266.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66277823 - 2² = 66277819 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66277873) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33138911 + 33138912.

It is an arithmetic number, because the mean of its divisors is an integer number (33138912).

Almost surely, 2^66277823 is an apocalyptic number.

66277823 is a deficient number, since it is larger than the sum of its proper divisors (1).

66277823 is an equidigital number, since it uses as much as digits as its factorization.

66277823 is an evil number, because the sum of its binary digits is even.

The product of its digits is 169344, while the sum is 41.

The square root of 66277823 is about 8141.1192719429. The cubic root of 66277823 is about 404.6902534351.

The spelling of 66277823 in words is "sixty-six million, two hundred seventy-seven thousand, eight hundred twenty-three".