81698146706 has 16 divisors (see below), whose sum is σ = 133778076768. Its totient is φ = 37110465600.

The previous prime is 81698146681. The next prime is 81698146787. The reversal of 81698146706 is 60764189618.

It is a Curzon 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, 1219415 + ... + 1284666.

It is an arithmetic number, because the mean of its divisors is an integer number (8361129798).

Almost surely, 2^81698146706 is an apocalyptic number.

81698146706 is a deficient number, since it is larger than the sum of its proper divisors (52079930062).

81698146706 is a wasteful number, since it uses less digits than its factorization.

81698146706 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2505577.

The product of its (nonzero) digits is 3483648, while the sum is 56.

The spelling of 81698146706 in words is "eighty-one billion, six hundred ninety-eight million, one hundred forty-six thousand, seven hundred six".