81017609358 has 32 divisors (see below), whose sum is σ = 185330315520. Its totient is φ = 23129487360.

The previous prime is 81017609353. The next prime is 81017609369. The reversal of 81017609358 is 85390671018.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81017609353) 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, 713203 + ... + 818958.

It is an arithmetic number, because the mean of its divisors is an integer number (5791572360).

Almost surely, 2^81017609358 is an apocalyptic number.

81017609358 is an abundant number, since it is smaller than the sum of its proper divisors (104312706162).

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

81017609358 is a wasteful number, since it uses less digits than its factorization.

81017609358 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1533432.

The product of its (nonzero) digits is 362880, while the sum is 48.

It can be divided in two parts, 8101760 and 9358, that added together give a palindrome (8111118).

The spelling of 81017609358 in words is "eighty-one billion, seventeen million, six hundred nine thousand, three hundred fifty-eight".