81698305288 has 32 divisors (see below), whose sum is σ = 163362074400. Its totient is φ = 38169660672.

The previous prime is 81698305223. The next prime is 81698305319. The reversal of 81698305288 is 88250389618.

It is a super-2 number, since 2×81698305288² (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, 2141970 + ... + 2179777.

It is an arithmetic number, because the mean of its divisors is an integer number (5105064825).

Almost surely, 2^81698305288 is an apocalyptic number.

It is an amenable number.

81698305288 is a deficient number, since it is larger than the sum of its proper divisors (81663769112).

81698305288 is a wasteful number, since it uses less digits than its factorization.

81698305288 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4321909 (or 4321905 counting only the distinct ones).

The product of its (nonzero) digits is 6635520, while the sum is 58.

The spelling of 81698305288 in words is "eighty-one billion, six hundred ninety-eight million, three hundred five thousand, two hundred eighty-eight".