81015287953 has 8 divisors (see below), whose sum is σ = 83150584776. Its totient is φ = 78887577600.

The previous prime is 81015287939. The next prime is 81015287993. The reversal of 81015287953 is 35978251018.

It can be written as a sum of positive squares in 4 ways, for example, as 8278816144 + 72736471809 = 90988^2 + 269697^2 .

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 81015287953 - 2¹⁷ = 81015156881 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 81015287897 and 81015287906.

It is not an unprimeable number, because it can be changed into a prime (81015287933) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1874976 + ... + 1917697.

It is an arithmetic number, because the mean of its divisors is an integer number (10393823097).

Almost surely, 2^81015287953 is an apocalyptic number.

It is an amenable number.

81015287953 is a deficient number, since it is larger than the sum of its proper divisors (2135296823).

81015287953 is a wasteful number, since it uses less digits than its factorization.

81015287953 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3793235.

The product of its (nonzero) digits is 604800, while the sum is 49.

The spelling of 81015287953 in words is "eighty-one billion, fifteen million, two hundred eighty-seven thousand, nine hundred fifty-three".