81602173351 has 16 divisors (see below), whose sum is σ = 88770860640. Its totient is φ = 74754247680.

The previous prime is 81602173349. The next prime is 81602173361. The reversal of 81602173351 is 15337120618.

It is a cyclic number.

It is not a de Polignac number, because 81602173351 - 2¹ = 81602173349 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 81602173351.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81602173361) 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, 375480 + ... + 551533.

It is an arithmetic number, because the mean of its divisors is an integer number (5548178790).

Almost surely, 2^81602173351 is an apocalyptic number.

81602173351 is a deficient number, since it is larger than the sum of its proper divisors (7168687289).

81602173351 is a wasteful number, since it uses less digits than its factorization.

81602173351 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 927186.

The product of its (nonzero) digits is 30240, while the sum is 37.

Adding to 81602173351 its reverse (15337120618), we get a palindrome (96939293969).

The spelling of 81602173351 in words is "eighty-one billion, six hundred two million, one hundred seventy-three thousand, three hundred fifty-one".