81302155168319 has 16 divisors (see below), whose sum is σ = 84973746923520. Its totient is φ = 77688453749760.

The previous prime is 81302155168307. The next prime is 81302155168357. The reversal of 81302155168319 is 91386155120318.

It is a cyclic number.

It is not a de Polignac number, because 81302155168319 - 2¹⁶ = 81302155102783 is a prime.

It is a super-2 number, since 2×81302155168319² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81302155168519) 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, 460852802 + ... + 461029184.

It is an arithmetic number, because the mean of its divisors is an integer number (5310859182720).

Almost surely, 2^{81302155168319} is an apocalyptic number.

81302155168319 is a deficient number, since it is larger than the sum of its proper divisors (3671591755201).

81302155168319 is a wasteful number, since it uses less digits than its factorization.

81302155168319 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 340370.

The product of its (nonzero) digits is 1555200, while the sum is 53.

The spelling of 81302155168319 in words is "eighty-one trillion, three hundred two billion, one hundred fifty-five million, one hundred sixty-eight thousand, three hundred nineteen".