1166555661547 has 8 divisors (see below), whose sum is σ = 1171706565744. Its totient is φ = 1161405990528.

The previous prime is 1166555661527. The next prime is 1166555661569. The reversal of 1166555661547 is 7451665556611.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1166555661547 is a prime.

It is a super-2 number, since 2×1166555661547² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1166555661491 and 1166555661500.

It is not an unprimeable number, because it can be changed into a prime (1166555661517) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1614228 + ... + 2222350.

It is an arithmetic number, because the mean of its divisors is an integer number (146463320718).

Almost surely, 2^{1166555661547} is an apocalyptic number.

1166555661547 is a deficient number, since it is larger than the sum of its proper divisors (5150904197).

1166555661547 is an equidigital number, since it uses as much as digits as its factorization.

1166555661547 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 616589.

The product of its digits is 22680000, while the sum is 58.

The spelling of 1166555661547 in words is "one trillion, one hundred sixty-six billion, five hundred fifty-five million, six hundred sixty-one thousand, five hundred forty-seven".