66877897 has 2 divisors, whose sum is σ = 66877898. Its totient is φ = 66877896.

The previous prime is 66877849. The next prime is 66877901. The reversal of 66877897 is 79877866.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 58003456 + 8874441 = 7616^2 + 2979^2 .

It is a cyclic number.

It is not a de Polignac number, because 66877897 - 2²³ = 58489289 is a prime.

It is not a weakly prime, because it can be changed into another prime (66877817) 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, 33438948 + 33438949.

It is an arithmetic number, because the mean of its divisors is an integer number (33438949).

Almost surely, 2^66877897 is an apocalyptic number.

It is an amenable number.

66877897 is a deficient number, since it is larger than the sum of its proper divisors (1).

66877897 is an equidigital number, since it uses as much as digits as its factorization.

66877897 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7112448, while the sum is 58.

The square root of 66877897 is about 8177.8907427282. The cubic root of 66877897 is about 405.9079300556.

The spelling of 66877897 in words is "sixty-six million, eight hundred seventy-seven thousand, eight hundred ninety-seven".