81708222045 has 8 divisors (see below), whose sum is σ = 130733155296. Its totient is φ = 43577718416.

The previous prime is 81708221941. The next prime is 81708222053. The reversal of 81708222045 is 54022280718.

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 81708222045 - 2⁸ = 81708221789 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 81708221994 and 81708222012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2723607387 + ... + 2723607416.

It is an arithmetic number, because the mean of its divisors is an integer number (16341644412).

Almost surely, 2^81708222045 is an apocalyptic number.

It is an amenable number.

81708222045 is a deficient number, since it is larger than the sum of its proper divisors (49024933251).

81708222045 is a wasteful number, since it uses less digits than its factorization.

81708222045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5447214811.

The product of its (nonzero) digits is 71680, while the sum is 39.

The spelling of 81708222045 in words is "eighty-one billion, seven hundred eight million, two hundred twenty-two thousand, forty-five".