1215550164 has 24 divisors (see below), whose sum is σ = 2836864800. Its totient is φ = 405100384.

The previous prime is 1215550121. The next prime is 1215550181. The reversal of 1215550164 is 4610555121.

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, 87787 + ... + 100685.

It is an arithmetic number, because the mean of its divisors is an integer number (118202700).

Almost surely, 2^1215550164 is an apocalyptic number.

It is an amenable number.

1215550164 is an abundant number, since it is smaller than the sum of its proper divisors (1621314636).

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

1215550164 is a wasteful number, since it uses less digits than its factorization.

1215550164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20759 (or 20757 counting only the distinct ones).

The product of its (nonzero) digits is 6000, while the sum is 30.

The square root of 1215550164 is about 34864.7409857007. The cubic root of 1215550164 is about 1067.2290266851.

The spelling of 1215550164 in words is "one billion, two hundred fifteen million, five hundred fifty thousand, one hundred sixty-four".