2171671873668 has 72 divisors (see below), whose sum is σ = 5990096994336. Its totient is φ = 657912355200.

The previous prime is 2171671873561. The next prime is 2171671873697. The reversal of 2171671873668 is 8663781761712.

2171671873668 is a `hidden beast` number, since 21 + 71 + 6 + 7 + 187 + 366 + 8 = 666.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 830355 + ... + 2243397.

It is an arithmetic number, because the mean of its divisors is an integer number (83195791588).

Almost surely, 2^{2171671873668} is an apocalyptic number.

It is an amenable number.

2171671873668 is an abundant number, since it is smaller than the sum of its proper divisors (3818425120668).

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

2171671873668 is a wasteful number, since it uses less digits than its factorization.

2171671873668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1416945 (or 1416940 counting only the distinct ones).

The product of its digits is 28449792, while the sum is 63.

The spelling of 2171671873668 in words is "two trillion, one hundred seventy-one billion, six hundred seventy-one million, eight hundred seventy-three thousand, six hundred sixty-eight".