81805062956 has 6 divisors (see below), whose sum is σ = 143158860180. Its totient is φ = 40902531476.

The previous prime is 81805062953. The next prime is 81805063009. The reversal of 81805062956 is 65926050818.

It is not an unprimeable number, because it can be changed into a prime (81805062953) 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 as a sum of consecutive naturals, namely, 10225632866 + ... + 10225632873.

It is an arithmetic number, because the mean of its divisors is an integer number (23859810030).

Almost surely, 2^81805062956 is an apocalyptic number.

It is an amenable number.

81805062956 is a deficient number, since it is larger than the sum of its proper divisors (61353797224).

81805062956 is a wasteful number, since it uses less digits than its factorization.

81805062956 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20451265743 (or 20451265741 counting only the distinct ones).

The product of its (nonzero) digits is 1036800, while the sum is 50.

The spelling of 81805062956 in words is "eighty-one billion, eight hundred five million, sixty-two thousand, nine hundred fifty-six".