66769677 has 20 divisors (see below), whose sum is σ = 107416540. Its totient is φ = 41088384.

The previous prime is 66769649. The next prime is 66769697. The reversal of 66769677 is 77696766.

It can be written as a sum of positive squares in 2 ways, for example, as 7001316 + 59768361 = 2646^2 + 7731^2 .

It is not a de Polignac number, because 66769677 - 2⁶ = 66769613 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66769627) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 30652 + ... + 32757.

It is an arithmetic number, because the mean of its divisors is an integer number (5370827).

Almost surely, 2^66769677 is an apocalyptic number.

It is an amenable number.

66769677 is a deficient number, since it is larger than the sum of its proper divisors (40646863).

66769677 is a wasteful number, since it uses less digits than its factorization.

66769677 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63434 (or 63425 counting only the distinct ones).

The product of its digits is 4000752, while the sum is 54.

The square root of 66769677 is about 8171.2714432945. The cubic root of 66769677 is about 405.6888687837.

The spelling of 66769677 in words is "sixty-six million, seven hundred sixty-nine thousand, six hundred seventy-seven".