81926374486 has 32 divisors (see below), whose sum is σ = 139924931328. Its totient is φ = 35611292640.

The previous prime is 81926374423. The next prime is 81926374507. The reversal of 81926374486 is 68447362918.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 81926374486.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2270740 + ... + 2306536.

It is an arithmetic number, because the mean of its divisors is an integer number (4372654104).

Almost surely, 2^81926374486 is an apocalyptic number.

81926374486 is a deficient number, since it is larger than the sum of its proper divisors (57998556842).

81926374486 is a wasteful number, since it uses less digits than its factorization.

81926374486 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40356.

The product of its digits is 13934592, while the sum is 58.

The spelling of 81926374486 in words is "eighty-one billion, nine hundred twenty-six million, three hundred seventy-four thousand, four hundred eighty-six".