81353554152 has 128 divisors (see below), whose sum is σ = 232217664000. Its totient is φ = 23543550720.

The previous prime is 81353554151. The next prime is 81353554153. The reversal of 81353554152 is 25145535318.

It is an interprime number because it is at equal distance from previous prime (81353554151) and next prime (81353554153).

It is not an unprimeable number, because it can be changed into a prime (81353554151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 774627 + ... + 873357.

It is an arithmetic number, because the mean of its divisors is an integer number (1814200500).

Almost surely, 2^81353554152 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 81353554152, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (116108832000).

81353554152 is an abundant number, since it is smaller than the sum of its proper divisors (150864109848).

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

81353554152 is a wasteful number, since it uses less digits than its factorization.

81353554152 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98911 (or 98907 counting only the distinct ones).

The product of its digits is 360000, while the sum is 42.

The spelling of 81353554152 in words is "eighty-one billion, three hundred fifty-three million, five hundred fifty-four thousand, one hundred fifty-two".