1215215166 has 32 divisors (see below), whose sum is σ = 2766659328. Its totient is φ = 352235840.

The previous prime is 1215215149. The next prime is 1215215173. The reversal of 1215215166 is 6615125121.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 398751 + ... + 401786.

It is an arithmetic number, because the mean of its divisors is an integer number (86458104).

Almost surely, 2^1215215166 is an apocalyptic number.

1215215166 is an abundant number, since it is smaller than the sum of its proper divisors (1551444162).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1215215166 is a wasteful number, since it uses less digits than its factorization.

1215215166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 800576.

The product of its digits is 3600, while the sum is 30.

The square root of 1215215166 is about 34859.9364026959. The cubic root of 1215215166 is about 1067.1309771356.

The spelling of 1215215166 in words is "one billion, two hundred fifteen million, two hundred fifteen thousand, one hundred sixty-six".