81858003696 has 600 divisors, whose sum is σ = 298274904720. Its totient is φ = 20825247744.

The previous prime is 81858003671. The next prime is 81858003709. The reversal of 81858003696 is 69630085818.

It is a super-3 number, since 3×81858003696³ (a number of 34 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 119 ways as a sum of consecutive naturals, for example, 111674946 + ... + 111675678.

Almost surely, 2^81858003696 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 81858003696, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (149137452360).

81858003696 is an abundant number, since it is smaller than the sum of its proper divisors (216416901024).

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

81858003696 is a wasteful number, since it uses less digits than its factorization.

81858003696 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 811 (or 781 counting only the distinct ones).

The product of its (nonzero) digits is 2488320, while the sum is 54.

The spelling of 81858003696 in words is "eighty-one billion, eight hundred fifty-eight million, three thousand, six hundred ninety-six".