1161661611 has 32 divisors (see below), whose sum is σ = 1725389568. Its totient is φ = 689293440.

The previous prime is 1161661607. The next prime is 1161661619.

1161661611 is nontrivially palindromic in base 10.

1161661611 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 1161661611 - 2² = 1161661607 is a prime.

It is a super-2 number, since 2×1161661611² = 2698915396942230642, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1161661619) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 380985 + ... + 384021.

It is an arithmetic number, because the mean of its divisors is an integer number (53918424).

Almost surely, 2^1161661611 is an apocalyptic number.

1161661611 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1161661611 is a deficient number, since it is larger than the sum of its proper divisors (563727957).

1161661611 is a wasteful number, since it uses less digits than its factorization.

1161661611 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3291.

The product of its digits is 1296, while the sum is 30.

The square root of 1161661611 is about 34083.1572921289. The cubic root of 1161661611 is about 1051.2190259145.

The spelling of 1161661611 in words is "one billion, one hundred sixty-one million, six hundred sixty-one thousand, six hundred eleven".