1165706661 has 8 divisors (see below), whose sum is σ = 1776314944. Its totient is φ = 666118080.

The previous prime is 1165706657. The next prime is 1165706693. The reversal of 1165706661 is 1666075611.

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

It is not a de Polignac number, because 1165706661 - 2² = 1165706657 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1165706611) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27754900 + ... + 27754941.

It is an arithmetic number, because the mean of its divisors is an integer number (222039368).

Almost surely, 2^1165706661 is an apocalyptic number.

It is an amenable number.

1165706661 is a deficient number, since it is larger than the sum of its proper divisors (610608283).

1165706661 is an equidigital number, since it uses as much as digits as its factorization.

1165706661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55509851.

The product of its (nonzero) digits is 45360, while the sum is 39.

The square root of 1165706661 is about 34142.4466170777. The cubic root of 1165706661 is about 1052.4377708011.

The spelling of 1165706661 in words is "one billion, one hundred sixty-five million, seven hundred six thousand, six hundred sixty-one".