71766644667 has 4 divisors (see below), whose sum is σ = 95688859560. Its totient is φ = 47844429776.

The previous prime is 71766644639. The next prime is 71766644669. The reversal of 71766644667 is 76644666717.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 71766644667 - 2⁶ = 71766644603 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 71766644667.

It is not an unprimeable number, because it can be changed into a prime (71766644669) 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, 11961107442 + ... + 11961107447.

It is an arithmetic number, because the mean of its divisors is an integer number (23922214890).

Almost surely, 2^71766644667 is an apocalyptic number.

71766644667 is a deficient number, since it is larger than the sum of its proper divisors (23922214893).

71766644667 is a wasteful number, since it uses less digits than its factorization.

71766644667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23922214892.

The product of its digits is 42674688, while the sum is 60.

The spelling of 71766644667 in words is "seventy-one billion, seven hundred sixty-six million, six hundred forty-four thousand, six hundred sixty-seven".