81225223416 has 40 divisors (see below), whose sum is σ = 227505835920. Its totient is φ = 27075074256.

The previous prime is 81225223411. The next prime is 81225223481. The reversal of 81225223416 is 61432252218.

81225223416 is a `hidden beast` number, since 8 + 12 + 2 + 5 + 223 + 416 = 666.

It is a super-2 number, since 2×81225223416² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81225223411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 62673136 + ... + 62674431.

It is an arithmetic number, because the mean of its divisors is an integer number (5687645898).

Almost surely, 2^81225223416 is an apocalyptic number.

It is an amenable number.

81225223416 is an abundant number, since it is smaller than the sum of its proper divisors (146280612504).

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

81225223416 is a wasteful number, since it uses less digits than its factorization.

81225223416 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125347585 (or 125347572 counting only the distinct ones).

The product of its digits is 46080, while the sum is 36.

The spelling of 81225223416 in words is "eighty-one billion, two hundred twenty-five million, two hundred twenty-three thousand, four hundred sixteen".