81367292160 has 1296 divisors, whose sum is σ = 366412999680. Its totient is φ = 16301260800.

The previous prime is 81367292137. The next prime is 81367292183. The reversal of 81367292160 is 6129276318.

It is an interprime number because it is at equal distance from previous prime (81367292137) and next prime (81367292183).

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 (17) of ones.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 302480506 + ... + 302480774.

It is an arithmetic number, because the mean of its divisors is an integer number (282726080).

Almost surely, 2^81367292160 is an apocalyptic number.

81367292160 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 81367292160, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (183206499840).

81367292160 is an abundant number, since it is smaller than the sum of its proper divisors (285045707520).

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

81367292160 is a wasteful number, since it uses less digits than its factorization.

81367292160 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 356 (or 328 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 45.

The spelling of 81367292160 in words is "eighty-one billion, three hundred sixty-seven million, two hundred ninety-two thousand, one hundred sixty".