81697102848 has 440 divisors, whose sum is σ = 252708110864. Its totient is φ = 26276659200.

The previous prime is 81697102819. The next prime is 81697102853. The reversal of 81697102848 is 84820179618.

It is a super-2 number, since 2×81697102848² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a junction number, because it is equal to n+sod(n) for n = 81697102794 and 81697102803.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 338992008 + ... + 338992248.

Almost surely, 2^81697102848 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81697102848, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (126354055432).

81697102848 is an abundant number, since it is smaller than the sum of its proper divisors (171011008016).

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

81697102848 is a wasteful number, since it uses less digits than its factorization.

81697102848 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 401 (or 374 counting only the distinct ones).

The product of its (nonzero) digits is 1548288, while the sum is 54.

The spelling of 81697102848 in words is "eighty-one billion, six hundred ninety-seven million, one hundred two thousand, eight hundred forty-eight".