1215166500 has 72 divisors (see below), whose sum is σ = 3833459448. Its totient is φ = 324043200.

The previous prime is 1215166493. The next prime is 1215166559. The reversal of 1215166500 is 56615121.

It is a happy number.

1215166500 is a `hidden beast` number, since 1 + 2 + 1 + 5 + 1 + 6 + 650 + 0 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 20358144 + 1194808356 = 4512^2 + 34566^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 130519 + ... + 139518.

Almost surely, 2^1215166500 is an apocalyptic number.

1215166500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1215166500 is an abundant number, since it is smaller than the sum of its proper divisors (2618292948).

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

1215166500 is a wasteful number, since it uses less digits than its factorization.

1215166500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 270062 (or 270047 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 27.

The square root of 1215166500 is about 34859.2383737798. The cubic root of 1215166500 is about 1067.1167317326.

The spelling of 1215166500 in words is "one billion, two hundred fifteen million, one hundred sixty-six thousand, five hundred".