81098709326 has 4 divisors (see below), whose sum is σ = 121648063992. Its totient is φ = 40549354662.

The previous prime is 81098709319. The next prime is 81098709359. The reversal of 81098709326 is 62390789018.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 62390789018 = 2 ⋅31195394509.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20274677330 + ... + 20274677333.

It is an arithmetic number, because the mean of its divisors is an integer number (30412015998).

Almost surely, 2^81098709326 is an apocalyptic number.

81098709326 is a deficient number, since it is larger than the sum of its proper divisors (40549354666).

81098709326 is a wasteful number, since it uses less digits than its factorization.

81098709326 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40549354665.

The product of its (nonzero) digits is 1306368, while the sum is 53.

The spelling of 81098709326 in words is "eighty-one billion, ninety-eight million, seven hundred nine thousand, three hundred twenty-six".