1156659381361 has 9 divisors (see below), whose sum is σ = 1271382406329. Its totient is φ = 1051497773700.

The previous prime is 1156659381349. The next prime is 1156659381373. The reversal of 1156659381361 is 1631839566511.

The square root of 1156659381361 is 1075481.

It is a perfect power (a square), and thus also a powerful number.

It is an interprime number because it is at equal distance from previous prime (1156659381349) and next prime (1156659381373).

It is not a de Polignac number, because 1156659381361 - 2²⁵ = 1156625826929 is a prime.

It is a super-2 number, since 2×1156659381361² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1156659381331) 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 8 ways as a sum of consecutive naturals, for example, 11781406 + ... + 11879176.

Almost surely, 2^{1156659381361} is an apocalyptic number.

1156659381361 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1156659381361 is the 1075481-st square number.

1156659381361 is the 537741-st centered octagonal number.

It is an amenable number.

1156659381361 is a deficient number, since it is larger than the sum of its proper divisors (114723024968).

1156659381361 is an frugal number, since it uses more digits than its factorization.

1156659381361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 195564 (or 97782 counting only the distinct ones).

The product of its digits is 3499200, while the sum is 55.

The spelling of 1156659381361 in words is "one trillion, one hundred fifty-six billion, six hundred fifty-nine million, three hundred eighty-one thousand, three hundred sixty-one".