21779806703694 has 64 divisors (see below), whose sum is σ = 47180565331200. Its totient is φ = 6662890144512.

The previous prime is 21779806703653. The next prime is 21779806703737. The reversal of 21779806703694 is 49630760897712.

It is a congruent number.

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 31 ways as a sum of consecutive naturals, for example, 82565242 + ... + 82828610.

It is an arithmetic number, because the mean of its divisors is an integer number (737196333300).

Almost surely, 2^{21779806703694} is an apocalyptic number.

21779806703694 is an abundant number, since it is smaller than the sum of its proper divisors (25400758627506).

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

21779806703694 is a wasteful number, since it uses less digits than its factorization.

21779806703694 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 269489.

The product of its (nonzero) digits is 192036096, while the sum is 69.

The spelling of 21779806703694 in words is "twenty-one trillion, seven hundred seventy-nine billion, eight hundred six million, seven hundred three thousand, six hundred ninety-four".