81501348717 has 8 divisors (see below), whose sum is σ = 120742738880. Its totient is φ = 54334232460.

The previous prime is 81501348697. The next prime is 81501348737. The reversal of 81501348717 is 71784310518.

81501348717 is a `hidden beast` number, since 8 + 150 + 1 + 3 + 487 + 17 = 666.

It is an interprime number because it is at equal distance from previous prime (81501348697) and next prime (81501348737).

It is not a de Polignac number, because 81501348717 - 2⁷ = 81501348589 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81501348737) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1509284209 + ... + 1509284262.

It is an arithmetic number, because the mean of its divisors is an integer number (15092842360).

Almost surely, 2^81501348717 is an apocalyptic number.

It is an amenable number.

81501348717 is a deficient number, since it is larger than the sum of its proper divisors (39241390163).

81501348717 is a wasteful number, since it uses less digits than its factorization.

81501348717 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3018568480 (or 3018568474 counting only the distinct ones).

The product of its (nonzero) digits is 188160, while the sum is 45.

The spelling of 81501348717 in words is "eighty-one billion, five hundred one million, three hundred forty-eight thousand, seven hundred seventeen".