66289779 has 16 divisors (see below), whose sum is σ = 98929440. Its totient is φ = 43868160.

The previous prime is 66289777. The next prime is 66289793. The reversal of 66289779 is 97798266.

66289779 is a `hidden beast` number, since 6 + 628 + 9 + 7 + 7 + 9 = 666.

It is not a de Polignac number, because 66289779 - 2¹ = 66289777 is a prime.

It is a zygodrome in base 2.

It is not an unprimeable number, because it can be changed into a prime (66289777) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5262 + ... + 12659.

It is an arithmetic number, because the mean of its divisors is an integer number (6183090).

Almost surely, 2^66289779 is an apocalyptic number.

66289779 is a deficient number, since it is larger than the sum of its proper divisors (32639661).

66289779 is a wasteful number, since it uses less digits than its factorization.

66289779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18067 (or 18061 counting only the distinct ones).

The product of its digits is 2286144, while the sum is 54.

The square root of 66289779 is about 8141.8535358971. The cubic root of 66289779 is about 404.7145862890.

It can be divided in two parts, 662897 and 79, that added together give a triangular number (662976 = T₁₁₅₁).

The spelling of 66289779 in words is "sixty-six million, two hundred eighty-nine thousand, seven hundred seventy-nine".