1161615665 has 16 divisors (see below), whose sum is σ = 1595438208. Its totient is φ = 795353856.

The previous prime is 1161615617. The next prime is 1161615709. The reversal of 1161615665 is 5665161611.

It is a cyclic number.

It is not a de Polignac number, because 1161615665 - 2⁸ = 1161615409 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 392 + ... + 48201.

It is an arithmetic number, because the mean of its divisors is an integer number (99714888).

Almost surely, 2^1161615665 is an apocalyptic number.

It is an amenable number.

1161615665 is a deficient number, since it is larger than the sum of its proper divisors (433822543).

1161615665 is an equidigital number, since it uses as much as digits as its factorization.

1161615665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49288.

The product of its digits is 32400, while the sum is 38.

The square root of 1161615665 is about 34082.4832575327. The cubic root of 1161615665 is about 1051.2051664723.

The spelling of 1161615665 in words is "one billion, one hundred sixty-one million, six hundred fifteen thousand, six hundred sixty-five".