66789896429 has 4 divisors (see below), whose sum is σ = 70718713884. Its totient is φ = 62861078976.

The previous prime is 66789896423. The next prime is 66789896431. The reversal of 66789896429 is 92469898766.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 53754422500 + 13035473929 = 231850^2 + 114173^2 .

It is not a de Polignac number, because 66789896429 - 2²⁴ = 66773119213 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66789896423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1964408702 + ... + 1964408735.

It is an arithmetic number, because the mean of its divisors is an integer number (17679678471).

Almost surely, 2^66789896429 is an apocalyptic number.

It is an amenable number.

66789896429 is a deficient number, since it is larger than the sum of its proper divisors (3928817455).

66789896429 is a wasteful number, since it uses less digits than its factorization.

66789896429 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3928817454.

The product of its digits is 564350976, while the sum is 74.

The spelling of 66789896429 in words is "sixty-six billion, seven hundred eighty-nine million, eight hundred ninety-six thousand, four hundred twenty-nine".