1165611601 has 32 divisors (see below), whose sum is σ = 1534648320. Its totient is φ = 860075280.

The previous prime is 1165611589. The next prime is 1165611617. The reversal of 1165611601 is 1061165611.

It is not a de Polignac number, because 1165611601 - 2⁵ = 1165611569 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1165611601.

It is not an unprimeable number, because it can be changed into a prime (1165611661) 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, 527040 + ... + 529246.

It is an arithmetic number, because the mean of its divisors is an integer number (47957760).

Almost surely, 2^1165611601 is an apocalyptic number.

1165611601 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1165611601 is a deficient number, since it is larger than the sum of its proper divisors (369036719).

1165611601 is an equidigital number, since it uses as much as digits as its factorization.

1165611601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2282 (or 2244 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 28.

The square root of 1165611601 is about 34141.0544799073. The cubic root of 1165611601 is about 1052.4091622733.

The spelling of 1165611601 in words is "one billion, one hundred sixty-five million, six hundred eleven thousand, six hundred one".