66013782563 has 4 divisors (see below), whose sum is σ = 66014422680. Its totient is φ = 66013142448.

The previous prime is 66013782547. The next prime is 66013782587. The reversal of 66013782563 is 36528731066.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 36528731066 = 2 ⋅18264365533.

It is a cyclic number.

It is not a de Polignac number, because 66013782563 - 2⁴ = 66013782547 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66013782463) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 126245 + ... + 384662.

It is an arithmetic number, because the mean of its divisors is an integer number (16503605670).

Almost surely, 2^66013782563 is an apocalyptic number.

66013782563 is a deficient number, since it is larger than the sum of its proper divisors (640117).

66013782563 is a wasteful number, since it uses less digits than its factorization.

66013782563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 640116.

The product of its (nonzero) digits is 1088640, while the sum is 47.

The spelling of 66013782563 in words is "sixty-six billion, thirteen million, seven hundred eighty-two thousand, five hundred sixty-three".