2291947878168 has 96 divisors (see below), whose sum is σ = 6685118425440. Its totient is φ = 705186201600.

The previous prime is 2291947878161. The next prime is 2291947878169. The reversal of 2291947878168 is 8618787491922.

2291947878168 is a `hidden beast` number, since 2 + 2 + 9 + 19 + 478 + 7 + 81 + 68 = 666.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a junction number, because it is equal to n+sod(n) for n = 2291947878096 and 2291947878105.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2291947878161) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 44294680 + ... + 44346392.

It is an arithmetic number, because the mean of its divisors is an integer number (69636650265).

Almost surely, 2^{2291947878168} is an apocalyptic number.

It is an amenable number.

2291947878168 is an abundant number, since it is smaller than the sum of its proper divisors (4393170547272).

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

2291947878168 is a wasteful number, since it uses less digits than its factorization.

2291947878168 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99089 (or 99082 counting only the distinct ones).

The product of its digits is 195084288, while the sum is 72.

The spelling of 2291947878168 in words is "two trillion, two hundred ninety-one billion, nine hundred forty-seven million, eight hundred seventy-eight thousand, one hundred sixty-eight".