66225165563 has 4 divisors (see below), whose sum is σ = 67023059208. Its totient is φ = 65427271920.

The previous prime is 66225165527. The next prime is 66225165593. The reversal of 66225165563 is 36556152266.

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 66225165563 - 2¹² = 66225161467 is a prime.

It is a super-2 number, since 2×66225165563² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66225165593) 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, 398946698 + ... + 398946863.

It is an arithmetic number, because the mean of its divisors is an integer number (16755764802).

Almost surely, 2^66225165563 is an apocalyptic number.

66225165563 is a deficient number, since it is larger than the sum of its proper divisors (797893645).

66225165563 is an equidigital number, since it uses as much as digits as its factorization.

66225165563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 797893644.

The product of its digits is 1944000, while the sum is 47.

The spelling of 66225165563 in words is "sixty-six billion, two hundred twenty-five million, one hundred sixty-five thousand, five hundred sixty-three".