66881334869 has 4 divisors (see below), whose sum is σ = 66886278144. Its totient is φ = 66876391596.

The previous prime is 66881334859. The next prime is 66881334901. The reversal of 66881334869 is 96843318866.

66881334869 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 66881334869 - 2²⁰ = 66880286293 is a prime.

It is a super-2 number, since 2×66881334869² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66881334859) 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, 2451287 + ... + 2478420.

It is an arithmetic number, because the mean of its divisors is an integer number (16721569536).

Almost surely, 2^66881334869 is an apocalyptic number.

It is an amenable number.

66881334869 is a deficient number, since it is larger than the sum of its proper divisors (4943275).

66881334869 is a wasteful number, since it uses less digits than its factorization.

66881334869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4943274.

The product of its digits is 35831808, while the sum is 62.

The spelling of 66881334869 in words is "sixty-six billion, eight hundred eighty-one million, three hundred thirty-four thousand, eight hundred sixty-nine".