1161566845 has 4 divisors (see below), whose sum is σ = 1393880220. Its totient is φ = 929253472.

The previous prime is 1161566831. The next prime is 1161566897. The reversal of 1161566845 is 5486651611.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 736959609 + 424607236 = 27147^2 + 20606^2 .

It is a cyclic number.

It is not a de Polignac number, because 1161566845 - 2⁷ = 1161566717 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 116156680 + ... + 116156689.

It is an arithmetic number, because the mean of its divisors is an integer number (348470055).

Almost surely, 2^1161566845 is an apocalyptic number.

It is an amenable number.

1161566845 is a deficient number, since it is larger than the sum of its proper divisors (232313375).

1161566845 is an equidigital number, since it uses as much as digits as its factorization.

1161566845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 232313374.

The product of its digits is 172800, while the sum is 43.

The square root of 1161566845 is about 34081.7670463255. The cubic root of 1161566845 is about 1051.1904396979.

The spelling of 1161566845 in words is "one billion, one hundred sixty-one million, five hundred sixty-six thousand, eight hundred forty-five".