81184356204 has 36 divisors (see below), whose sum is σ = 220357539864. Its totient is φ = 23195530176.

The previous prime is 81184356181. The next prime is 81184356217. The reversal of 81184356204 is 40265348118.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 69033729 + ... + 69034904.

It is an arithmetic number, because the mean of its divisors is an integer number (6121042774).

Almost surely, 2^81184356204 is an apocalyptic number.

81184356204 is a gapful number since it is divisible by the number (84) formed by its first and last digit.

It is an amenable number.

81184356204 is an abundant number, since it is smaller than the sum of its proper divisors (139173183660).

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

81184356204 is a wasteful number, since it uses less digits than its factorization.

81184356204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138068654 (or 138068645 counting only the distinct ones).

The product of its (nonzero) digits is 184320, while the sum is 42.

The spelling of 81184356204 in words is "eighty-one billion, one hundred eighty-four million, three hundred fifty-six thousand, two hundred four".