1155271663 has 12 divisors (see below), whose sum is σ = 1429686768. Its totient is φ = 914060160.

The previous prime is 1155271661. The next prime is 1155271679. The reversal of 1155271663 is 3661725511.

It is not a de Polignac number, because 1155271663 - 2¹ = 1155271661 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1155271661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 487098 + ... + 489463.

It is an arithmetic number, because the mean of its divisors is an integer number (119140564).

Almost surely, 2^1155271663 is an apocalyptic number.

1155271663 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1155271663 is a deficient number, since it is larger than the sum of its proper divisors (274415105).

1155271663 is an equidigital number, since it uses as much as digits as its factorization.

1155271663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 976594 (or 976581 counting only the distinct ones).

The product of its digits is 37800, while the sum is 37.

The square root of 1155271663 is about 33989.2874741440. The cubic root of 1155271663 is about 1049.2880019641.

The spelling of 1155271663 in words is "one billion, one hundred fifty-five million, two hundred seventy-one thousand, six hundred sixty-three".