81717023181630 has 32 divisors (see below), whose sum is σ = 196127597047968. Its totient is φ = 21790457136000.

The previous prime is 81717023181581. The next prime is 81717023181631. The reversal of 81717023181630 is 3618132071718.

It is a self number, because there is not a number n which added to its sum of digits gives 81717023181630.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81717023181631) 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, 45927781 + ... + 47673840.

It is an arithmetic number, because the mean of its divisors is an integer number (6128987407749).

Almost surely, 2^{81717023181630} is an apocalyptic number.

81717023181630 is an abundant number, since it is smaller than the sum of its proper divisors (114410573866338).

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

81717023181630 is a wasteful number, since it uses less digits than its factorization.

81717023181630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93630732.

The product of its (nonzero) digits is 338688, while the sum is 48.

The spelling of 81717023181630 in words is "eighty-one trillion, seven hundred seventeen billion, twenty-three million, one hundred eighty-one thousand, six hundred thirty".