1116555056661 has 48 divisors (see below), whose sum is σ = 1659878023104. Its totient is φ = 667043520000.

The previous prime is 1116555056629. The next prime is 1116555056693. The reversal of 1116555056661 is 1666505556111.

It is an interprime number because it is at equal distance from previous prime (1116555056629) and next prime (1116555056693).

It is not a de Polignac number, because 1116555056661 - 2⁵ = 1116555056629 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1116555056661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1116555054661) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 8255421 + ... + 8389581.

It is an arithmetic number, because the mean of its divisors is an integer number (34580792148).

Almost surely, 2^{1116555056661} is an apocalyptic number.

1116555056661 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1116555056661 is a deficient number, since it is larger than the sum of its proper divisors (543322966443).

1116555056661 is a wasteful number, since it uses less digits than its factorization.

1116555056661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134514 (or 134503 counting only the distinct ones).

The product of its (nonzero) digits is 810000, while the sum is 48.

It can be divided in two parts, 11165550 and 56661, that added together give a palindrome (11222211).

The spelling of 1116555056661 in words is "one trillion, one hundred sixteen billion, five hundred fifty-five million, fifty-six thousand, six hundred sixty-one".