1215897661342 has 48 divisors (see below), whose sum is σ = 2295323498880. Its totient is φ = 472861617696.

The previous prime is 1215897661243. The next prime is 1215897661387. The reversal of 1215897661342 is 2431667985121.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4215528 + ... + 4494715.

It is an arithmetic number, because the mean of its divisors is an integer number (47819239560).

Almost surely, 2^{1215897661342} is an apocalyptic number.

1215897661342 is a deficient number, since it is larger than the sum of its proper divisors (1079425837538).

1215897661342 is a wasteful number, since it uses less digits than its factorization.

1215897661342 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8710337 (or 8710324 counting only the distinct ones).

The product of its digits is 4354560, while the sum is 55.

The spelling of 1215897661342 in words is "one trillion, two hundred fifteen billion, eight hundred ninety-seven million, six hundred sixty-one thousand, three hundred forty-two".