81127964100 has 72 divisors (see below), whose sum is σ = 242302213888. Its totient is φ = 20936246400.

The previous prime is 81127964083. The next prime is 81127964107. The reversal of 81127964100 is 146972118.

It is not an unprimeable number, because it can be changed into a prime (81127964107) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4352419 + ... + 4371018.

Almost surely, 2^81127964100 is an apocalyptic number.

It is an amenable number.

81127964100 is an abundant number, since it is smaller than the sum of its proper divisors (161174249788).

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

81127964100 is a wasteful number, since it uses less digits than its factorization.

81127964100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8723485 (or 8723478 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 39.

The spelling of 81127964100 in words is "eighty-one billion, one hundred twenty-seven million, nine hundred sixty-four thousand, one hundred".