66215065363 has 4 divisors (see below), whose sum is σ = 67754950648. Its totient is φ = 64675180080.

The previous prime is 66215065339. The next prime is 66215065373. The reversal of 66215065363 is 36356051266.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66215065363 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (43), and also a Moran number because the ratio is a prime number: 1539885241 = 66215065363 / (6 + 6 + 2 + 1 + 5 + 0 + 6 + 5 + 3 + 6 + 3).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66215065373) 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, 769942578 + ... + 769942663.

It is an arithmetic number, because the mean of its divisors is an integer number (16938737662).

Almost surely, 2^66215065363 is an apocalyptic number.

66215065363 is a deficient number, since it is larger than the sum of its proper divisors (1539885285).

66215065363 is a wasteful number, since it uses less digits than its factorization.

66215065363 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1539885284.

The product of its (nonzero) digits is 583200, while the sum is 43.

The spelling of 66215065363 in words is "sixty-six billion, two hundred fifteen million, sixty-five thousand, three hundred sixty-three".