2115947731520 has 448 divisors, whose sum is σ = 6320332800000. Its totient is φ = 658311929856.

The previous prime is 2115947731517. The next prime is 2115947731543. The reversal of 2115947731520 is 251377495112.

It is a tau number, because it is divible by the number of its divisors (448).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 156741731 + ... + 156755229.

Almost surely, 2^{2115947731520} is an apocalyptic number.

2115947731520 is a gapful number since it is divisible by the number (20) 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 2115947731520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3160166400000).

2115947731520 is an abundant number, since it is smaller than the sum of its proper divisors (4204385068480).

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

2115947731520 is a wasteful number, since it uses less digits than its factorization.

2115947731520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13698 (or 13688 counting only the distinct ones).

The product of its (nonzero) digits is 529200, while the sum is 47.

The spelling of 2115947731520 in words is "two trillion, one hundred fifteen billion, nine hundred forty-seven million, seven hundred thirty-one thousand, five hundred twenty".