66704765765 has 8 divisors (see below), whose sum is σ = 87322602528. Its totient is φ = 48512556880.

The previous prime is 66704765723. The next prime is 66704765779. The reversal of 66704765765 is 56756740766.

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

It is not a de Polignac number, because 66704765765 - 2²⁶ = 66637656901 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 606406907 + ... + 606407016.

It is an arithmetic number, because the mean of its divisors is an integer number (10915325316).

Almost surely, 2^66704765765 is an apocalyptic number.

It is an amenable number.

66704765765 is a deficient number, since it is larger than the sum of its proper divisors (20617836763).

66704765765 is a wasteful number, since it uses less digits than its factorization.

66704765765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1212813939.

The product of its (nonzero) digits is 44452800, while the sum is 59.

The spelling of 66704765765 in words is "sixty-six billion, seven hundred four million, seven hundred sixty-five thousand, seven hundred sixty-five".