66774787 has 2 divisors, whose sum is σ = 66774788. Its totient is φ = 66774786.

The previous prime is 66774749. The next prime is 66774803. The reversal of 66774787 is 78747766.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66774787 - 2²³ = 58386179 is a prime.

It is not a weakly prime, because it can be changed into another prime (66774707) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33387393 + 33387394.

It is an arithmetic number, because the mean of its divisors is an integer number (33387394).

Almost surely, 2^66774787 is an apocalyptic number.

66774787 is a deficient number, since it is larger than the sum of its proper divisors (1).

66774787 is an equidigital number, since it uses as much as digits as its factorization.

66774787 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2765952, while the sum is 52.

The square root of 66774787 is about 8171.5841181499. The cubic root of 66774787 is about 405.6992178790.

The spelling of 66774787 in words is "sixty-six million, seven hundred seventy-four thousand, seven hundred eighty-seven".