81794790502221 has 8 divisors (see below), whose sum is σ = 113801447655360. Its totient is φ = 52158996841952.

The previous prime is 81794790502211. The next prime is 81794790502241. The reversal of 81794790502221 is 12220509749718.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 81794790502221 - 2⁵ = 81794790502189 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81794790502211) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 592715873136 + ... + 592715873273.

It is an arithmetic number, because the mean of its divisors is an integer number (14225180956920).

Almost surely, 2^{81794790502221} is an apocalyptic number.

It is an amenable number.

81794790502221 is a deficient number, since it is larger than the sum of its proper divisors (32006657153139).

81794790502221 is a wasteful number, since it uses less digits than its factorization.

81794790502221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1185431746435.

The product of its (nonzero) digits is 5080320, while the sum is 57.

The spelling of 81794790502221 in words is "eighty-one trillion, seven hundred ninety-four billion, seven hundred ninety million, five hundred two thousand, two hundred twenty-one".