664562438117 has 2 divisors, whose sum is σ = 664562438118. Its totient is φ = 664562438116.

The previous prime is 664562438077. The next prime is 664562438203. The reversal of 664562438117 is 711834265466.

It is a happy number.

664562438117 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 can be written as a sum of positive squares in only one way, i.e., 659074443556 + 5487994561 = 811834^2 + 74081^2 .

It is a cyclic number.

It is not a de Polignac number, because 664562438117 - 2¹² = 664562434021 is a prime.

It is a super-2 number, since 2×664562438117² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (664562434117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332281219058 + 332281219059.

It is an arithmetic number, because the mean of its divisors is an integer number (332281219059).

Almost surely, 2^664562438117 is an apocalyptic number.

It is an amenable number.

664562438117 is a deficient number, since it is larger than the sum of its proper divisors (1).

664562438117 is an equidigital number, since it uses as much as digits as its factorization.

664562438117 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5806080, while the sum is 53.

The spelling of 664562438117 in words is "six hundred sixty-four billion, five hundred sixty-two million, four hundred thirty-eight thousand, one hundred seventeen".