91821668714374 has 16 divisors (see below), whose sum is σ = 137817656962560. Its totient is φ = 45882457844040.

The previous prime is 91821668714359. The next prime is 91821668714387. The reversal of 91821668714374 is 47341786612819.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20637319 + ... + 24688909.

It is an arithmetic number, because the mean of its divisors is an integer number (8613603560160).

Almost surely, 2^{91821668714374} is an apocalyptic number.

91821668714374 is a deficient number, since it is larger than the sum of its proper divisors (45995988248186).

91821668714374 is a wasteful number, since it uses less digits than its factorization.

91821668714374 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4058595.

The product of its digits is 97542144, while the sum is 67.

The spelling of 91821668714374 in words is "ninety-one trillion, eight hundred twenty-one billion, six hundred sixty-eight million, seven hundred fourteen thousand, three hundred seventy-four".