2161961478688 has 24 divisors (see below), whose sum is σ = 4643303631120. Its totient is φ = 982709762880.

The previous prime is 2161961478671. The next prime is 2161961478713. The reversal of 2161961478688 is 8868741691612.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3070967658 + ... + 3070968361.

It is an arithmetic number, because the mean of its divisors is an integer number (193470984630).

Almost surely, 2^{2161961478688} is an apocalyptic number.

It is an amenable number.

2161961478688 is an abundant number, since it is smaller than the sum of its proper divisors (2481342152432).

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

2161961478688 is a wasteful number, since it uses less digits than its factorization.

2161961478688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6141936040 (or 6141936032 counting only the distinct ones).

The product of its digits is 55738368, while the sum is 67.

The spelling of 2161961478688 in words is "two trillion, one hundred sixty-one billion, nine hundred sixty-one million, four hundred seventy-eight thousand, six hundred eighty-eight".