1215065663666 has 8 divisors (see below), whose sum is σ = 1822807847280. Its totient is φ = 607463047908.

The previous prime is 1215065663653. The next prime is 1215065663683. The reversal of 1215065663666 is 6663665605121.

It is a sphenic number, since it is the product of 3 distinct primes.

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, 34870196 + ... + 34905023.

It is an arithmetic number, because the mean of its divisors is an integer number (227850980910).

Almost surely, 2^{1215065663666} is an apocalyptic number.

1215065663666 is a deficient number, since it is larger than the sum of its proper divisors (607742183614).

1215065663666 is an equidigital number, since it uses as much as digits as its factorization.

1215065663666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69783928.

The product of its (nonzero) digits is 6998400, while the sum is 53.

The spelling of 1215065663666 in words is "one trillion, two hundred fifteen billion, sixty-five million, six hundred sixty-three thousand, six hundred sixty-six".