1155778748017 has 4 divisors (see below), whose sum is σ = 1177585894260. Its totient is φ = 1133971601776.

The previous prime is 1155778748011. The next prime is 1155778748063. The reversal of 1155778748017 is 7108478775511.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 848285208576 + 307493539441 = 921024^2 + 554521^2 .

It is a cyclic number.

It is not a de Polignac number, because 1155778748017 - 2⁷ = 1155778747889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1155778748011) 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, 10903573042 + ... + 10903573147.

It is an arithmetic number, because the mean of its divisors is an integer number (294396473565).

Almost surely, 2^{1155778748017} is an apocalyptic number.

It is an amenable number.

1155778748017 is a deficient number, since it is larger than the sum of its proper divisors (21807146243).

1155778748017 is an equidigital number, since it uses as much as digits as its factorization.

1155778748017 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21807146242.

The product of its (nonzero) digits is 15366400, while the sum is 61.

The spelling of 1155778748017 in words is "one trillion, one hundred fifty-five billion, seven hundred seventy-eight million, seven hundred forty-eight thousand, seventeen".