81550502269464 has 128 divisors (see below), whose sum is σ = 216519562399680. Its totient is φ = 25507391078400.

The previous prime is 81550502269451. The next prime is 81550502269469. The reversal of 81550502269464 is 46496220505518.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81550502269469) 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 31 ways as a sum of consecutive naturals, for example, 846957004 + ... + 847053284.

Almost surely, 2^{81550502269464} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81550502269464, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (108259781199840).

81550502269464 is an abundant number, since it is smaller than the sum of its proper divisors (134969060130216).

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

81550502269464 is a wasteful number, since it uses less digits than its factorization.

81550502269464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102541 (or 102537 counting only the distinct ones).

The product of its (nonzero) digits is 20736000, while the sum is 57.

The spelling of 81550502269464 in words is "eighty-one trillion, five hundred fifty billion, five hundred two million, two hundred sixty-nine thousand, four hundred sixty-four".