81698294680 has 32 divisors (see below), whose sum is σ = 194634174240. Its totient is φ = 30757004800.

The previous prime is 81698294677. The next prime is 81698294723. The reversal of 81698294680 is 8649289618.

It is a super-2 number, since 2×81698294680² (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, 60071596 + ... + 60072955.

It is an arithmetic number, because the mean of its divisors is an integer number (6082317945).

Almost surely, 2^81698294680 is an apocalyptic number.

It is an amenable number.

81698294680 is an abundant number, since it is smaller than the sum of its proper divisors (112935879560).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81698294680 is a wasteful number, since it uses less digits than its factorization.

81698294680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120144579 (or 120144575 counting only the distinct ones).

The product of its (nonzero) digits is 11943936, while the sum is 61.

The spelling of 81698294680 in words is "eighty-one billion, six hundred ninety-eight million, two hundred ninety-four thousand, six hundred eighty".