81344385160 has 32 divisors (see below), whose sum is σ = 186478170840. Its totient is φ = 31923833344.

The previous prime is 81344385137. The next prime is 81344385169. The reversal of 81344385160 is 6158344318.

It can be written as a sum of positive squares in 4 ways, for example, as 65555457444 + 15788927716 = 256038^2 + 125654^2 .

It is not an unprimeable number, because it can be changed into a prime (81344385169) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19182877 + ... + 19187116.

Almost surely, 2^81344385160 is an apocalyptic number.

It is an amenable number.

81344385160 is an abundant number, since it is smaller than the sum of its proper divisors (105133785680).

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

81344385160 is a wasteful number, since it uses less digits than its factorization.

81344385160 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38370057 (or 38370053 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 43.

The spelling of 81344385160 in words is "eighty-one billion, three hundred forty-four million, three hundred eighty-five thousand, one hundred sixty".