81708222046 has 16 divisors (see below), whose sum is σ = 133739474688. Its totient is φ = 37130347800.

The previous prime is 81708221941. The next prime is 81708222053. The reversal of 81708222046 is 64022280718.

It is a super-2 number, since 2×81708222046² (a number of 23 digits) contains 22 as substring.

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, 401640 + ... + 569851.

It is an arithmetic number, because the mean of its divisors is an integer number (8358717168).

Almost surely, 2^81708222046 is an apocalyptic number.

81708222046 is a deficient number, since it is larger than the sum of its proper divisors (52031252642).

81708222046 is a wasteful number, since it uses less digits than its factorization.

81708222046 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 975327.

The product of its (nonzero) digits is 86016, while the sum is 40.

The spelling of 81708222046 in words is "eighty-one billion, seven hundred eight million, two hundred twenty-two thousand, forty-six".