81418234188 has 24 divisors (see below), whose sum is σ = 191342616640. Its totient is φ = 26944163280.

The previous prime is 81418234187. The next prime is 81418234273. The reversal of 81418234188 is 88143281418.

It is not an unprimeable number, because it can be changed into a prime (81418234187) 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, 24404278 + ... + 24407613.

Almost surely, 2^81418234188 is an apocalyptic number.

It is an amenable number.

81418234188 is an abundant number, since it is smaller than the sum of its proper divisors (109924382452).

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

81418234188 is a wasteful number, since it uses less digits than its factorization.

81418234188 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48812037 (or 48812035 counting only the distinct ones).

The product of its digits is 393216, while the sum is 48.

The spelling of 81418234188 in words is "eighty-one billion, four hundred eighteen million, two hundred thirty-four thousand, one hundred eighty-eight".