81562479360319 has 8 divisors (see below), whose sum is σ = 82902448130912. Its totient is φ = 80222603459040.

The previous prime is 81562479360287. The next prime is 81562479360337. The reversal of 81562479360319 is 91306397426518.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 81562479360319 - 2⁵ = 81562479360287 is a prime.

It is a super-2 number, since 2×81562479360319² (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 (81562479360619) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21445299 + ... + 24960484.

It is an arithmetic number, because the mean of its divisors is an integer number (10362806016364).

It is a 2-persistent number, because it is pandigital, and so is 2⋅81562479360319 = 163124958720638, but 3⋅81562479360319 = 244687438080957 is not.

Almost surely, 2^{81562479360319} is an apocalyptic number.

81562479360319 is a deficient number, since it is larger than the sum of its proper divisors (1339968770593).

81562479360319 is a wasteful number, since it uses less digits than its factorization.

81562479360319 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46434657.

The product of its (nonzero) digits is 58786560, while the sum is 64.

The spelling of 81562479360319 in words is "eighty-one trillion, five hundred sixty-two billion, four hundred seventy-nine million, three hundred sixty thousand, three hundred nineteen".