1161212566 has 8 divisors (see below), whose sum is σ = 1742976144. Its totient is φ = 580220520.

The previous prime is 1161212501. The next prime is 1161212573. The reversal of 1161212566 is 6652121611.

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

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, 189105 + ... + 195148.

It is an arithmetic number, because the mean of its divisors is an integer number (217872018).

Almost surely, 2^1161212566 is an apocalyptic number.

1161212566 is a deficient number, since it is larger than the sum of its proper divisors (581763578).

1161212566 is a wasteful number, since it uses less digits than its factorization.

1161212566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 385766.

The product of its digits is 4320, while the sum is 31.

The square root of 1161212566 is about 34076.5691641632. The cubic root of 1161212566 is about 1051.0835574672.

The spelling of 1161212566 in words is "one billion, one hundred sixty-one million, two hundred twelve thousand, five hundred sixty-six".