81364877846340 has 48 divisors (see below), whose sum is σ = 248532717787200. Its totient is φ = 19724818871680.

The previous prime is 81364877846339. The next prime is 81364877846341. The reversal of 81364877846340 is 4364877846318.

It is an interprime number because it is at equal distance from previous prime (81364877846339) and next prime (81364877846341).

It is not an unprimeable number, because it can be changed into a prime (81364877846341) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 61640058315 + ... + 61640059634.

It is an arithmetic number, because the mean of its divisors is an integer number (5177764953900).

Almost surely, 2^{81364877846340} is an apocalyptic number.

It is an amenable number.

81364877846340 is an abundant number, since it is smaller than the sum of its proper divisors (167167839940860).

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

81364877846340 is a wasteful number, since it uses less digits than its factorization.

81364877846340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123280117972 (or 123280117970 counting only the distinct ones).

The product of its (nonzero) digits is 520224768, while the sum is 69.

The spelling of 81364877846340 in words is "eighty-one trillion, three hundred sixty-four billion, eight hundred seventy-seven million, eight hundred forty-six thousand, three hundred forty".