1166552261 has 20 divisors (see below), whose sum is σ = 1365487500. Its totient is φ = 996532992.

The previous prime is 1166552239. The next prime is 1166552263. The reversal of 1166552261 is 1622556611.

It can be written as a sum of positive squares in 2 ways, for example, as 372721636 + 793830625 = 19306^2 + 28175^2 .

It is a de Polignac number, because none of the positive numbers 2^k-1166552261 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1166552263) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 933365 + ... + 934613.

It is an arithmetic number, because the mean of its divisors is an integer number (68274375).

Almost surely, 2^1166552261 is an apocalyptic number.

It is an amenable number.

1166552261 is a deficient number, since it is larger than the sum of its proper divisors (198935239).

1166552261 is an frugal number, since it uses more digits than its factorization.

1166552261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1666 (or 1645 counting only the distinct ones).

The product of its digits is 21600, while the sum is 35.

The square root of 1166552261 is about 34154.8277846632. The cubic root of 1166552261 is about 1052.6921876593.

The spelling of 1166552261 in words is "one billion, one hundred sixty-six million, five hundred fifty-two thousand, two hundred sixty-one".