1215266516 has 12 divisors (see below), whose sum is σ = 2176175232. Its totient is φ = 593502168.

The previous prime is 1215266509. The next prime is 1215266531. The reversal of 1215266516 is 6156625121.

It is a hoax number, since the sum of its digits (35) coincides with the sum of the digits of its distinct prime factors.

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, 3532580 + ... + 3532923.

It is an arithmetic number, because the mean of its divisors is an integer number (181347936).

Almost surely, 2^1215266516 is an apocalyptic number.

It is an amenable number.

1215266516 is a deficient number, since it is larger than the sum of its proper divisors (960908716).

1215266516 is a wasteful number, since it uses less digits than its factorization.

1215266516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7065550 (or 7065548 counting only the distinct ones).

The product of its digits is 21600, while the sum is 35.

The square root of 1215266516 is about 34860.6729137577. The cubic root of 1215266516 is about 1067.1460077808.

The spelling of 1215266516 in words is "one billion, two hundred fifteen million, two hundred sixty-six thousand, five hundred sixteen".