66105005610263 has 4 divisors (see below), whose sum is σ = 66105144755328. Its totient is φ = 66104866465200.

The previous prime is 66105005610253. The next prime is 66105005610421. The reversal of 66105005610263 is 36201650050166.

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

It is a cyclic number.

It is not a de Polignac number, because 66105005610263 - 2²⁴ = 66104988833047 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66105005610263.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66105005610253) 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, 68857463 + ... + 69810888.

It is an arithmetic number, because the mean of its divisors is an integer number (16526286188832).

Almost surely, 2^{66105005610263} is an apocalyptic number.

66105005610263 is a deficient number, since it is larger than the sum of its proper divisors (139145065).

66105005610263 is a wasteful number, since it uses less digits than its factorization.

66105005610263 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139145064.

The product of its (nonzero) digits is 194400, while the sum is 41.

The spelling of 66105005610263 in words is "sixty-six trillion, one hundred five billion, five million, six hundred ten thousand, two hundred sixty-three".