1215353385866 has 8 divisors (see below), whose sum is σ = 1861817952960. Its totient is φ = 594747401548.

The previous prime is 1215353385823. The next prime is 1215353385881. The reversal of 1215353385866 is 6685833535121.

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

It is a Curzon 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, 6464645576 + ... + 6464645763.

It is an arithmetic number, because the mean of its divisors is an integer number (232727244120).

Almost surely, 2^{1215353385866} is an apocalyptic number.

1215353385866 is a deficient number, since it is larger than the sum of its proper divisors (646464567094).

1215353385866 is a wasteful number, since it uses less digits than its factorization.

1215353385866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12929291388.

The product of its digits is 15552000, while the sum is 56.

The spelling of 1215353385866 in words is "one trillion, two hundred fifteen billion, three hundred fifty-three million, three hundred eighty-five thousand, eight hundred sixty-six".