66764086439 has 8 divisors (see below), whose sum is σ = 68410742400. Its totient is φ = 65121703416.

The previous prime is 66764086429. The next prime is 66764086469. The reversal of 66764086439 is 93468046766.

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 not a de Polignac number, because 66764086439 - 2²⁸ = 66495650983 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66764086429) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1036589 + ... + 1099110.

It is an arithmetic number, because the mean of its divisors is an integer number (8551342800).

Almost surely, 2^66764086439 is an apocalyptic number.

66764086439 is a deficient number, since it is larger than the sum of its proper divisors (1646655961).

66764086439 is a wasteful number, since it uses less digits than its factorization.

66764086439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2136469.

The product of its (nonzero) digits is 31352832, while the sum is 59.

The spelling of 66764086439 in words is "sixty-six billion, seven hundred sixty-four million, eighty-six thousand, four hundred thirty-nine".