1155563785263 has 4 divisors (see below), whose sum is σ = 1540751713688. Its totient is φ = 770375856840.

The previous prime is 1155563785231. The next prime is 1155563785279. The reversal of 1155563785263 is 3625873655511.

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

It is not a de Polignac number, because 1155563785263 - 2⁵ = 1155563785231 is a prime.

It is a super-2 number, since 2×1155563785263² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1155563785223) 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, 192593964208 + ... + 192593964213.

It is an arithmetic number, because the mean of its divisors is an integer number (385187928422).

Almost surely, 2^{1155563785263} is an apocalyptic number.

1155563785263 is a deficient number, since it is larger than the sum of its proper divisors (385187928425).

1155563785263 is an equidigital number, since it uses as much as digits as its factorization.

1155563785263 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 385187928424.

The product of its digits is 22680000, while the sum is 57.

The spelling of 1155563785263 in words is "one trillion, one hundred fifty-five billion, five hundred sixty-three million, seven hundred eighty-five thousand, two hundred sixty-three".