1215787670817 has 8 divisors (see below), whose sum is σ = 1629196209600. Its totient is φ = 806452122960.

The previous prime is 1215787670807. The next prime is 1215787670863. The reversal of 1215787670817 is 7180767875121.

It is a happy number.

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

It is not a de Polignac number, because 1215787670817 - 2¹⁰ = 1215787669793 is a prime.

It is a super-3 number, since 3×1215787670817³ (a number of 37 digits) contains 333 as substring.

It is a Smith number, since the sum of its digits (60) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (1215787670807) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1018247034 + ... + 1018248227.

It is an arithmetic number, because the mean of its divisors is an integer number (203649526200).

Almost surely, 2^{1215787670817} is an apocalyptic number.

It is an amenable number.

1215787670817 is a deficient number, since it is larger than the sum of its proper divisors (413408538783).

1215787670817 is a wasteful number, since it uses less digits than its factorization.

1215787670817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2036495463.

The product of its (nonzero) digits is 9219840, while the sum is 60.

The spelling of 1215787670817 in words is "one trillion, two hundred fifteen billion, seven hundred eighty-seven million, six hundred seventy thousand, eight hundred seventeen".