64641416669 has 2 divisors, whose sum is σ = 64641416670. Its totient is φ = 64641416668.

The previous prime is 64641416627. The next prime is 64641416681. The reversal of 64641416669 is 96661414646.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 64226764900 + 414651769 = 253430^2 + 20363^2 .

It is a cyclic number.

It is not a de Polignac number, because 64641416669 - 2¹⁶ = 64641351133 is a prime.

It is a super-2 number, since 2×64641416669² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 64641416669.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64641416689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32320708334 + 32320708335.

It is an arithmetic number, because the mean of its divisors is an integer number (32320708335).

Almost surely, 2^64641416669 is an apocalyptic number.

It is an amenable number.

64641416669 is a deficient number, since it is larger than the sum of its proper divisors (1).

64641416669 is an equidigital number, since it uses as much as digits as its factorization.

64641416669 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4478976, while the sum is 53.

The spelling of 64641416669 in words is "sixty-four billion, six hundred forty-one million, four hundred sixteen thousand, six hundred sixty-nine".