81015717494073 has 32 divisors (see below), whose sum is σ = 115255811635200. Its totient is φ = 50474266776000.

The previous prime is 81015717494069. The next prime is 81015717494081. The reversal of 81015717494073 is 37049471751018.

It is not a de Polignac number, because 81015717494073 - 2² = 81015717494069 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is not an unprimeable number, because it can be changed into a prime (81015717494473) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 24403983 + ... + 27524276.

It is an arithmetic number, because the mean of its divisors is an integer number (3601744113600).

Almost surely, 2^{81015717494073} is an apocalyptic number.

It is an amenable number.

81015717494073 is a deficient number, since it is larger than the sum of its proper divisors (34240094141127).

81015717494073 is a wasteful number, since it uses less digits than its factorization.

81015717494073 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51928653.

The product of its (nonzero) digits is 5927040, while the sum is 57.

The spelling of 81015717494073 in words is "eighty-one trillion, fifteen billion, seven hundred seventeen million, four hundred ninety-four thousand, seventy-three".