81598944698 has 16 divisors (see below), whose sum is σ = 125687491944. Its totient is φ = 39716904960.

The previous prime is 81598944667. The next prime is 81598944701. The reversal of 81598944698 is 89644989518.

It can be written as a sum of positive squares in 4 ways, for example, as 17089548529 + 64509396169 = 130727^2 + 253987^2 .

It is a super-2 number, since 2×81598944698² (a number of 23 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (71) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3435815 + ... + 3459482.

Almost surely, 2^81598944698 is an apocalyptic number.

81598944698 is a deficient number, since it is larger than the sum of its proper divisors (44088547246).

81598944698 is a wasteful number, since it uses less digits than its factorization.

81598944698 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6895457.

The product of its digits is 179159040, while the sum is 71.

The spelling of 81598944698 in words is "eighty-one billion, five hundred ninety-eight million, nine hundred forty-four thousand, six hundred ninety-eight".