81636024960 has 1536 divisors, whose sum is σ = 359280230400. Its totient is φ = 17318707200.

The previous prime is 81636024949. The next prime is 81636024971. The reversal of 81636024960 is 6942063618.

81636024960 is a `hidden beast` number, since 8 + 1 + 636 + 0 + 2 + 4 + 9 + 6 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (81636024949) and next prime (81636024971).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 1383661411 + ... + 1383661469.

It is an arithmetic number, because the mean of its divisors is an integer number (233906400).

Almost surely, 2^81636024960 is an apocalyptic number.

81636024960 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81636024960, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (179640115200).

81636024960 is an abundant number, since it is smaller than the sum of its proper divisors (277644205440).

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

81636024960 is a wasteful number, since it uses less digits than its factorization.

81636024960 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172 (or 148 counting only the distinct ones).

The product of its (nonzero) digits is 373248, while the sum is 45.

The spelling of 81636024960 in words is "eighty-one billion, six hundred thirty-six million, twenty-four thousand, nine hundred sixty".