1161156866 has 16 divisors (see below), whose sum is σ = 1796646840. Its totient is φ = 562412160.

The previous prime is 1161156827. The next prime is 1161156881. The reversal of 1161156866 is 6686511611.

It can be written as a sum of positive squares in 4 ways, for example, as 975625225 + 185531641 = 31235^2 + 13621^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17315 + ... + 51206.

Almost surely, 2^1161156866 is an apocalyptic number.

1161156866 is a deficient number, since it is larger than the sum of its proper divisors (635489974).

1161156866 is a wasteful number, since it uses less digits than its factorization.

1161156866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68789.

The product of its digits is 51840, while the sum is 41.

The square root of 1161156866 is about 34075.7518772514. The cubic root of 1161156866 is about 1051.0667513883.

The spelling of 1161156866 in words is "one billion, one hundred sixty-one million, one hundred fifty-six thousand, eight hundred sixty-six".