66764744464771 has 4 divisors (see below), whose sum is σ = 66764767711432. Its totient is φ = 66764721218112.

The previous prime is 66764744464751. The next prime is 66764744464793. The reversal of 66764744464771 is 17746444746766.

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-66764744464771 is a prime.

It is a super-2 number, since 2×66764744464771² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66764744464694 and 66764744464703.

It is not an unprimeable number, because it can be changed into a prime (66764744464751) 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, 6588270 + ... + 13301683.

It is an arithmetic number, because the mean of its divisors is an integer number (16691191927858).

Almost surely, 2^{66764744464771} is an apocalyptic number.

66764744464771 is a deficient number, since it is larger than the sum of its proper divisors (23246661).

66764744464771 is a wasteful number, since it uses less digits than its factorization.

66764744464771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23246660.

The product of its digits is 3186376704, while the sum is 73.

The spelling of 66764744464771 in words is "sixty-six trillion, seven hundred sixty-four billion, seven hundred forty-four million, four hundred sixty-four thousand, seven hundred seventy-one".