81698646248 has 16 divisors (see below), whose sum is σ = 153242352960. Its totient is φ = 40834018800.

The previous prime is 81698646233. The next prime is 81698646259. The reversal of 81698646248 is 84264689618.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1890338 + ... + 1933073.

It is an arithmetic number, because the mean of its divisors is an integer number (9577647060).

Almost surely, 2^81698646248 is an apocalyptic number.

It is an amenable number.

81698646248 is a deficient number, since it is larger than the sum of its proper divisors (71543706712).

81698646248 is a wasteful number, since it uses less digits than its factorization.

81698646248 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3826088 (or 3826084 counting only the distinct ones).

The product of its digits is 31850496, while the sum is 62.

The spelling of 81698646248 in words is "eighty-one billion, six hundred ninety-eight million, six hundred forty-six thousand, two hundred forty-eight".