81875333197 has 48 divisors (see below), whose sum is σ = 101802127104. Its totient is φ = 64465632000.

The previous prime is 81875333161. The next prime is 81875333209. The reversal of 81875333197 is 79133357818.

It is not a de Polignac number, because 81875333197 - 2⁷ = 81875333069 is a prime.

It is a super-2 number, since 2×81875333197² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81875333597) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 10940697 + ... + 10948177.

It is an arithmetic number, because the mean of its divisors is an integer number (2120877648).

Almost surely, 2^81875333197 is an apocalyptic number.

It is an amenable number.

81875333197 is a deficient number, since it is larger than the sum of its proper divisors (19926793907).

81875333197 is a wasteful number, since it uses less digits than its factorization.

81875333197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7658 (or 7639 counting only the distinct ones).

The product of its digits is 3810240, while the sum is 55.

The spelling of 81875333197 in words is "eighty-one billion, eight hundred seventy-five million, three hundred thirty-three thousand, one hundred ninety-seven".