1156656565666 has 24 divisors (see below), whose sum is σ = 2018290728960. Its totient is φ = 495699383592.

The previous prime is 1156656565637. The next prime is 1156656565679. The reversal of 1156656565666 is 6665656566511.

It is a Smith number, since the sum of its digits (64) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 1156656565598 and 1156656565607.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6010975 + ... + 6200413.

It is an arithmetic number, because the mean of its divisors is an integer number (84095447040).

Almost surely, 2^{1156656565666} is an apocalyptic number.

1156656565666 is a deficient number, since it is larger than the sum of its proper divisors (861634163294).

1156656565666 is a wasteful number, since it uses less digits than its factorization.

1156656565666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 251758 (or 251751 counting only the distinct ones).

The product of its digits is 174960000, while the sum is 64.

It can be divided in two parts, 11 and 56656565666, that multiplied together give a palindrome (623222222326).

The spelling of 1156656565666 in words is "one trillion, one hundred fifty-six billion, six hundred fifty-six million, five hundred sixty-five thousand, six hundred sixty-six".