1215615656166 has 8 divisors (see below), whose sum is σ = 2431231312344. Its totient is φ = 405205218720.

The previous prime is 1215615656161. The next prime is 1215615656173. The reversal of 1215615656166 is 6616565165121.

It is a happy number.

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

1215615656166 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1215615656161) 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, 101301304675 + ... + 101301304686.

It is an arithmetic number, because the mean of its divisors is an integer number (303903914043).

Almost surely, 2^{1215615656166} is an apocalyptic number.

1215615656166 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.

1215615656166 is a wasteful number, since it uses less digits than its factorization.

1215615656166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 202602609366.

The product of its digits is 1944000, while the sum is 51.

It can be divided in two parts, 1215615 and 656166, that added together give a palindrome (1871781).

The spelling of 1215615656166 in words is "one trillion, two hundred fifteen billion, six hundred fifteen million, six hundred fifty-six thousand, one hundred sixty-six".