66769769 has 8 divisors (see below), whose sum is σ = 74075040. Its totient is φ = 59670400.

The previous prime is 66769757. The next prime is 66769777. The reversal of 66769769 is 96796766.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66769769 is a prime.

It is a super-2 number, since 2×66769769² = 8916404104626722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66769789) 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 in 7 ways as a sum of consecutive naturals, for example, 50792 + ... + 52089.

It is an arithmetic number, because the mean of its divisors is an integer number (9259380).

Almost surely, 2^66769769 is an apocalyptic number.

It is an amenable number.

66769769 is a deficient number, since it is larger than the sum of its proper divisors (7305271).

66769769 is a wasteful number, since it uses less digits than its factorization.

66769769 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102951.

The product of its digits is 5143824, while the sum is 56.

The square root of 66769769 is about 8171.2770727714. The cubic root of 66769769 is about 405.6890551126.

It can be divided in two parts, 667697 and 69, that added together give a palindrome (667766).

The spelling of 66769769 in words is "sixty-six million, seven hundred sixty-nine thousand, seven hundred sixty-nine".