74665856647 has 2 divisors, whose sum is σ = 74665856648. Its totient is φ = 74665856646.

The previous prime is 74665856627. The next prime is 74665856687.

74665856647 is nontrivially palindromic in base 10.

It is a weak prime.

It is a palprime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-74665856647 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (74665856627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37332928323 + 37332928324.

It is an arithmetic number, because the mean of its divisors is an integer number (37332928324).

Almost surely, 2^74665856647 is an apocalyptic number.

74665856647 is a deficient number, since it is larger than the sum of its proper divisors (1).

74665856647 is an equidigital number, since it uses as much as digits as its factorization.

74665856647 is an evil number, because the sum of its binary digits is even.

The product of its digits is 203212800, while the sum is 64.

The spelling of 74665856647 in words is "seventy-four billion, six hundred sixty-five million, eight hundred fifty-six thousand, six hundred forty-seven".