81353540140 has 24 divisors (see below), whose sum is σ = 170956926000. Its totient is φ = 32519608128.

The previous prime is 81353540119. The next prime is 81353540141. The reversal of 81353540140 is 4104535318.

It is a junction number, because it is equal to n+sod(n) for n = 81353540096 and 81353540105.

It is not an unprimeable number, because it can be changed into a prime (81353540141) 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, 1332390 + ... + 1392109.

It is an arithmetic number, because the mean of its divisors is an integer number (7123205250).

Almost surely, 2^81353540140 is an apocalyptic number.

It is an amenable number.

81353540140 is an abundant number, since it is smaller than the sum of its proper divisors (89603385860).

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

81353540140 is a wasteful number, since it uses less digits than its factorization.

81353540140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2726001 (or 2725999 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 34.

The spelling of 81353540140 in words is "eighty-one billion, three hundred fifty-three million, five hundred forty thousand, one hundred forty".