66775927 has 2 divisors, whose sum is σ = 66775928. Its totient is φ = 66775926.

The previous prime is 66775913. The next prime is 66775931. The reversal of 66775927 is 72957766.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66775927 - 2¹¹ = 66773879 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66775957) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33387963 + 33387964.

It is an arithmetic number, because the mean of its divisors is an integer number (33387964).

Almost surely, 2^66775927 is an apocalyptic number.

66775927 is a deficient number, since it is larger than the sum of its proper divisors (1).

66775927 is an equidigital number, since it uses as much as digits as its factorization.

66775927 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1111320, while the sum is 49.

The square root of 66775927 is about 8171.6538717692. The cubic root of 66775927 is about 405.7015266070.

The spelling of 66775927 in words is "sixty-six million, seven hundred seventy-five thousand, nine hundred twenty-seven".