66256202643 has 16 divisors (see below), whose sum is σ = 90024431616. Its totient is φ = 43329684320.

The previous prime is 66256202599. The next prime is 66256202653. The reversal of 66256202643 is 34620265266.

It is a cyclic number.

It is not a de Polignac number, because 66256202643 - 2²⁶ = 66189093779 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 66256202595 and 66256202604.

It is not an unprimeable number, because it can be changed into a prime (66256202653) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 940846 + ... + 1008812.

It is an arithmetic number, because the mean of its divisors is an integer number (5626526976).

Almost surely, 2^66256202643 is an apocalyptic number.

66256202643 is a deficient number, since it is larger than the sum of its proper divisors (23768228973).

66256202643 is a wasteful number, since it uses less digits than its factorization.

66256202643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74154.

The product of its (nonzero) digits is 622080, while the sum is 42.

The spelling of 66256202643 in words is "sixty-six billion, two hundred fifty-six million, two hundred two thousand, six hundred forty-three".