1215887399646 has 8 divisors (see below), whose sum is σ = 2431774799304. Its totient is φ = 405295799880.

The previous prime is 1215887399633. The next prime is 1215887399647. The reversal of 1215887399646 is 6469937885121.

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

1215887399646 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1215887399647) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 101323949965 + ... + 101323949976.

It is an arithmetic number, because the mean of its divisors is an integer number (303971849913).

Almost surely, 2^{1215887399646} is an apocalyptic number.

1215887399646 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

1215887399646 is a wasteful number, since it uses less digits than its factorization.

1215887399646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 202647899946.

The product of its digits is 156764160, while the sum is 69.

The spelling of 1215887399646 in words is "one trillion, two hundred fifteen billion, eight hundred eighty-seven million, three hundred ninety-nine thousand, six hundred forty-six".