1215991198332 has 144 divisors (see below), whose sum is σ = 3154654339200. Its totient is φ = 394752669696.

The previous prime is 1215991198309. The next prime is 1215991198339. The reversal of 1215991198332 is 2338911995121.

It is a happy number.

1215991198332 is a `hidden beast` number, since 1 + 2 + 1 + 599 + 1 + 19 + 8 + 3 + 32 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1215991198339) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 328911108 + ... + 328914804.

It is an arithmetic number, because the mean of its divisors is an integer number (21907321800).

Almost surely, 2^{1215991198332} is an apocalyptic number.

1215991198332 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1215991198332, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1577327169600).

1215991198332 is an abundant number, since it is smaller than the sum of its proper divisors (1938663140868).

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

1215991198332 is a wasteful number, since it uses less digits than its factorization.

1215991198332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4660 (or 4655 counting only the distinct ones).

The product of its digits is 1049760, while the sum is 54.

The spelling of 1215991198332 in words is "one trillion, two hundred fifteen billion, nine hundred ninety-one million, one hundred ninety-eight thousand, three hundred thirty-two".