66853776959 has 4 divisors (see below), whose sum is σ = 67120126920. Its totient is φ = 66587427000.

The previous prime is 66853776947. The next prime is 66853776961. The reversal of 66853776959 is 95967735866.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66853776959 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66853776892 and 66853776901.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66853776359) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 133174604 + ... + 133175105.

It is an arithmetic number, because the mean of its divisors is an integer number (16780031730).

Almost surely, 2^66853776959 is an apocalyptic number.

66853776959 is a deficient number, since it is larger than the sum of its proper divisors (266349961).

66853776959 is a wasteful number, since it uses less digits than its factorization.

66853776959 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 266349960.

The product of its digits is 514382400, while the sum is 71.

The spelling of 66853776959 in words is "sixty-six billion, eight hundred fifty-three million, seven hundred seventy-six thousand, nine hundred fifty-nine".