1215731053440 has 192 divisors, whose sum is σ = 4198665229200. Its totient is φ = 324149084160.

The previous prime is 1215731053421. The next prime is 1215731053469. The reversal of 1215731053440 is 443501375121.

1215731053440 is a `hidden beast` number, since 1 + 2 + 1 + 5 + 73 + 10 + 534 + 40 = 666.

It is a tau number, because it is divible by the number of its divisors (192).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 1215731053395 and 1215731053404.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 66167455 + ... + 66185825.

Almost surely, 2^{1215731053440} is an apocalyptic number.

1215731053440 is a gapful number since it is divisible by the number (10) 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 1215731053440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2099332614600).

1215731053440 is an abundant number, since it is smaller than the sum of its proper divisors (2982934175760).

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

1215731053440 is a wasteful number, since it uses less digits than its factorization.

1215731053440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29885 (or 29870 counting only the distinct ones).

The product of its (nonzero) digits is 50400, while the sum is 36.

The spelling of 1215731053440 in words is "one trillion, two hundred fifteen billion, seven hundred thirty-one million, fifty-three thousand, four hundred forty".