1215161566 has 8 divisors (see below), whose sum is σ = 1824248664. Its totient is φ = 607078680.

The previous prime is 1215161551. The next prime is 1215161569. The reversal of 1215161566 is 6651615121.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1215161569) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 248020 + ... + 252871.

It is an arithmetic number, because the mean of its divisors is an integer number (228031083).

Almost surely, 2^1215161566 is an apocalyptic number.

1215161566 is a deficient number, since it is larger than the sum of its proper divisors (609087098).

1215161566 is a wasteful number, since it uses less digits than its factorization.

1215161566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 502106.

The product of its digits is 10800, while the sum is 34.

The square root of 1215161566 is about 34859.1676033723. The cubic root of 1215161566 is about 1067.1152874419.

Adding to 1215161566 its reverse (6651615121), we get a palindrome (7866776687).

The spelling of 1215161566 in words is "one billion, two hundred fifteen million, one hundred sixty-one thousand, five hundred sixty-six".