81698290848 has 48 divisors (see below), whose sum is σ = 238286684160. Its totient is φ = 27232763328.

The previous prime is 81698290813. The next prime is 81698290853. The reversal of 81698290848 is 84809289618.

It is a tau number, because it is divible by the number of its divisors (48).

It is a super-2 number, since 2×81698290848² (a number of 23 digits) contains 22 as substring.

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, 47278240 + ... + 47279967.

It is an arithmetic number, because the mean of its divisors is an integer number (4964305920).

Almost surely, 2^81698290848 is an apocalyptic number.

It is an amenable number.

81698290848 is an abundant number, since it is smaller than the sum of its proper divisors (156588393312).

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

81698290848 is a wasteful number, since it uses less digits than its factorization.

81698290848 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94558226 (or 94558212 counting only the distinct ones).

The product of its (nonzero) digits is 15925248, while the sum is 63.

The spelling of 81698290848 in words is "eighty-one billion, six hundred ninety-eight million, two hundred ninety thousand, eight hundred forty-eight".