2115981881643 has 96 divisors (see below), whose sum is σ = 3442205521920. Its totient is φ = 1151376145920.

The previous prime is 2115981881627. The next prime is 2115981881647. The reversal of 2115981881643 is 3461881895112.

It is a happy number.

It is not a de Polignac number, because 2115981881643 - 2⁴ = 2115981881627 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2115981881647) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 315391173 + ... + 315397881.

It is an arithmetic number, because the mean of its divisors is an integer number (35856307520).

Almost surely, 2^{2115981881643} is an apocalyptic number.

2115981881643 is a deficient number, since it is larger than the sum of its proper divisors (1326223640277).

2115981881643 is a wasteful number, since it uses less digits than its factorization.

2115981881643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7857 (or 7850 counting only the distinct ones).

The product of its digits is 3317760, while the sum is 57.

The spelling of 2115981881643 in words is "two trillion, one hundred fifteen billion, nine hundred eighty-one million, eight hundred eighty-one thousand, six hundred forty-three".