1215251166 has 16 divisors (see below), whose sum is σ = 2433017088. Its totient is φ = 404664600.

The previous prime is 1215251117. The next prime is 1215251183. The reversal of 1215251166 is 6611525121.

1215251166 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 98470 + ... + 110121.

It is an arithmetic number, because the mean of its divisors is an integer number (152063568).

Almost surely, 2^1215251166 is an apocalyptic number.

1215251166 is an abundant number, since it is smaller than the sum of its proper divisors (1217765922).

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

1215251166 is a wasteful number, since it uses less digits than its factorization.

1215251166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 209567.

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

The square root of 1215251166 is about 34860.4527509325. The cubic root of 1215251166 is about 1067.1415147307.

Adding to 1215251166 its reverse (6611525121), we get a palindrome (7826776287).

The spelling of 1215251166 in words is "one billion, two hundred fifteen million, two hundred fifty-one thousand, one hundred sixty-six".