1215105166 has 32 divisors (see below), whose sum is σ = 2023418880. Its totient is φ = 542625600.

The previous prime is 1215105149. The next prime is 1215105167. The reversal of 1215105166 is 6615015121.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1215105167) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 705186 + ... + 706906.

It is an arithmetic number, because the mean of its divisors is an integer number (63231840).

Almost surely, 2^1215105166 is an apocalyptic number.

1215105166 is a deficient number, since it is larger than the sum of its proper divisors (808313714).

1215105166 is a wasteful number, since it uses less digits than its factorization.

1215105166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2280.

The product of its (nonzero) digits is 1800, while the sum is 28.

The square root of 1215105166 is about 34858.3586245824. The cubic root of 1215105166 is about 1067.0987776391.

The spelling of 1215105166 in words is "one billion, two hundred fifteen million, one hundred five thousand, one hundred sixty-six".