64813680671 has 2 divisors, whose sum is σ = 64813680672. Its totient is φ = 64813680670.

The previous prime is 64813680643. The next prime is 64813680727. The reversal of 64813680671 is 17608631846.

64813680671 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64813680671 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64813680641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32406840335 + 32406840336.

It is an arithmetic number, because the mean of its divisors is an integer number (32406840336).

Almost surely, 2^64813680671 is an apocalyptic number.

64813680671 is a deficient number, since it is larger than the sum of its proper divisors (1).

64813680671 is an equidigital number, since it uses as much as digits as its factorization.

64813680671 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1161216, while the sum is 50.

The spelling of 64813680671 in words is "sixty-four billion, eight hundred thirteen million, six hundred eighty thousand, six hundred seventy-one".