81068781100 has 18 divisors (see below), whose sum is σ = 175919255204. Its totient is φ = 32427512400.

The previous prime is 81068781097. The next prime is 81068781103. The reversal of 81068781100 is 118786018.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (81068781097) and next prime (81068781103).

It is not an unprimeable number, because it can be changed into a prime (81068781103) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 405343806 + ... + 405344005.

Almost surely, 2^81068781100 is an apocalyptic number.

It is an amenable number.

81068781100 is an abundant number, since it is smaller than the sum of its proper divisors (94850474104).

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

81068781100 is a wasteful number, since it uses less digits than its factorization.

81068781100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 810687825 (or 810687818 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 40.

The spelling of 81068781100 in words is "eighty-one billion, sixty-eight million, seven hundred eighty-one thousand, one hundred".