1156261663 has 4 divisors (see below), whose sum is σ = 1217117560. Its totient is φ = 1095405768.

The previous prime is 1156261637. The next prime is 1156261709. The reversal of 1156261663 is 3661626511.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3661626511 = 241 ⋅15193471.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1156261663 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 (1156261633) 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 3 ways as a sum of consecutive naturals, for example, 30427920 + ... + 30427957.

It is an arithmetic number, because the mean of its divisors is an integer number (304279390).

Almost surely, 2^1156261663 is an apocalyptic number.

1156261663 is a deficient number, since it is larger than the sum of its proper divisors (60855897).

1156261663 is an equidigital number, since it uses as much as digits as its factorization.

1156261663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60855896.

The product of its digits is 38880, while the sum is 37.

The square root of 1156261663 is about 34003.8477675689. The cubic root of 1156261663 is about 1049.5876424635.

The spelling of 1156261663 in words is "one billion, one hundred fifty-six million, two hundred sixty-one thousand, six hundred sixty-three".