81384620224 has 14 divisors (see below), whose sum is σ = 161497605884. Its totient is φ = 40692310080.

The previous prime is 81384620221. The next prime is 81384620249. The reversal of 81384620224 is 42202648318.

It is not an unprimeable number, because it can be changed into a prime (81384620221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 635817282 + ... + 635817409.

Almost surely, 2^81384620224 is an apocalyptic number.

It is an amenable number.

81384620224 is a deficient number, since it is larger than the sum of its proper divisors (80112985660).

81384620224 is a wasteful number, since it uses less digits than its factorization.

81384620224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1271634703 (or 1271634693 counting only the distinct ones).

The product of its (nonzero) digits is 147456, while the sum is 40.

The spelling of 81384620224 in words is "eighty-one billion, three hundred eighty-four million, six hundred twenty thousand, two hundred twenty-four".