81770069426 has 16 divisors (see below), whose sum is σ = 123021639000. Its totient is φ = 40762944768.

The previous prime is 81770069413. The next prime is 81770069441. The reversal of 81770069426 is 62496007718.

It can be written as a sum of positive squares in 4 ways, for example, as 72999934225 + 8770135201 = 270185^2 + 93649^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1962506 + ... + 2003738.

Almost surely, 2^81770069426 is an apocalyptic number.

81770069426 is a deficient number, since it is larger than the sum of its proper divisors (41251569574).

81770069426 is a wasteful number, since it uses less digits than its factorization.

81770069426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44173.

The product of its (nonzero) digits is 1016064, while the sum is 50.

The spelling of 81770069426 in words is "eighty-one billion, seven hundred seventy million, sixty-nine thousand, four hundred twenty-six".