66648393369 has 12 divisors (see below), whose sum is σ = 99589553700. Its totient is φ = 42900115104.

The previous prime is 66648393349. The next prime is 66648393397. The reversal of 66648393369 is 96339384666.

66648393369 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 15671784969 + 50976608400 = 125187^2 + 225780^2 .

It is not a de Polignac number, because 66648393369 - 2¹⁵ = 66648360601 is a prime.

It is a super-2 number, since 2×66648393369² (a number of 22 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (63) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (66648393349) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 127678654 + ... + 127679175.

It is an arithmetic number, because the mean of its divisors is an integer number (8299129475).

Almost surely, 2^66648393369 is an apocalyptic number.

It is an amenable number.

66648393369 is a deficient number, since it is larger than the sum of its proper divisors (32941160331).

66648393369 is a wasteful number, since it uses less digits than its factorization.

66648393369 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 255357864 (or 255357861 counting only the distinct ones).

The product of its digits is 90699264, while the sum is 63.

The spelling of 66648393369 in words is "sixty-six billion, six hundred forty-eight million, three hundred ninety-three thousand, three hundred sixty-nine".