66068019369 has 27 divisors (see below), whose sum is σ = 104909341719. Its totient is φ = 40036083120.

The previous prime is 66068019341. The next prime is 66068019371. The reversal of 66068019369 is 96391086066.

The square root of 66068019369 is 257037.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 39060383769 + 27007635600 = 197637^2 + 164340^2 .

It is not a de Polignac number, because 66068019369 - 2¹¹ = 66068017321 is a prime.

It is a super-2 number, since 2×66068019369² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (66068019389) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 8478327 + ... + 8486115.

Almost surely, 2^66068019369 is an apocalyptic number.

66068019369 is the 257037-th square number.

66068019369 is the 128519-th centered octagonal number.

It is an amenable number.

66068019369 is a deficient number, since it is larger than the sum of its proper divisors (38841322350).

66068019369 is an frugal number, since it uses more digits than its factorization.

66068019369 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15606 (or 7803 counting only the distinct ones).

The product of its (nonzero) digits is 2519424, while the sum is 54.

The spelling of 66068019369 in words is "sixty-six billion, sixty-eight million, nineteen thousand, three hundred sixty-nine".