81837251896 has 32 divisors (see below), whose sum is σ = 161537922000. Its totient is φ = 38760926976.

The previous prime is 81837251869. The next prime is 81837251897. The reversal of 81837251896 is 69815273818.

It is a self number, because there is not a number n which added to its sum of digits gives 81837251896.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81837251897) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1807260 + ... + 1851988.

Almost surely, 2^81837251896 is an apocalyptic number.

It is an amenable number.

81837251896 is a deficient number, since it is larger than the sum of its proper divisors (79700670104).

81837251896 is a wasteful number, since it uses less digits than its factorization.

81837251896 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56791 (or 56787 counting only the distinct ones).

The product of its digits is 5806080, while the sum is 58.

The spelling of 81837251896 in words is "eighty-one billion, eight hundred thirty-seven million, two hundred fifty-one thousand, eight hundred ninety-six".