66684067797 has 4 divisors (see below), whose sum is σ = 88912090400. Its totient is φ = 44456045196.

The previous prime is 66684067789. The next prime is 66684067799. The reversal of 66684067797 is 79776048666.

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 not a de Polignac number, because 66684067797 - 2³ = 66684067789 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 (66684067799) 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, 11114011297 + ... + 11114011302.

It is an arithmetic number, because the mean of its divisors is an integer number (22228022600).

Almost surely, 2^66684067797 is an apocalyptic number.

It is an amenable number.

66684067797 is a deficient number, since it is larger than the sum of its proper divisors (22228022603).

66684067797 is a wasteful number, since it uses less digits than its factorization.

66684067797 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22228022602.

The product of its (nonzero) digits is 128024064, while the sum is 66.

The spelling of 66684067797 in words is "sixty-six billion, six hundred eighty-four million, sixty-seven thousand, seven hundred ninety-seven".