1155860665 has 8 divisors (see below), whose sum is σ = 1400766408. Its totient is φ = 915532800.

The previous prime is 1155860663. The next prime is 1155860669. The reversal of 1155860665 is 5660685511.

It can be written as a sum of positive squares in 4 ways, for example, as 285846649 + 870014016 = 16907^2 + 29496^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1155860665 - 2¹ = 1155860663 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1155860663) by changing a digit.

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, 1143912 + ... + 1144921.

It is an arithmetic number, because the mean of its divisors is an integer number (175095801).

Almost surely, 2^1155860665 is an apocalyptic number.

It is an amenable number.

1155860665 is a deficient number, since it is larger than the sum of its proper divisors (244905743).

1155860665 is a wasteful number, since it uses less digits than its factorization.

1155860665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2288939.

The product of its (nonzero) digits is 216000, while the sum is 43.

The square root of 1155860665 is about 33997.9508941348. The cubic root of 1155860665 is about 1049.4662941496.

It can be divided in two parts, 11 and 55860665, that added together give a square (55860676 = 7474²).

The spelling of 1155860665 in words is "one billion, one hundred fifty-five million, eight hundred sixty thousand, six hundred sixty-five".