81182056450 has 24 divisors (see below), whose sum is σ = 164725773840. Its totient is φ = 29520747600.

The previous prime is 81182056433. The next prime is 81182056477. The reversal of 81182056450 is 5465028118.

It is a happy number.

It is a super-3 number, since 3×81182056450³ (a number of 34 digits) contains 333 as substring.

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, 73801320 + ... + 73802419.

It is an arithmetic number, because the mean of its divisors is an integer number (6863573910).

Almost surely, 2^81182056450 is an apocalyptic number.

81182056450 is an abundant number, since it is smaller than the sum of its proper divisors (83543717390).

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

81182056450 is a wasteful number, since it uses less digits than its factorization.

81182056450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147603762 (or 147603757 counting only the distinct ones).

The product of its (nonzero) digits is 76800, while the sum is 40.

The spelling of 81182056450 in words is "eighty-one billion, one hundred eighty-two million, fifty-six thousand, four hundred fifty".