81467495717 has 4 divisors (see below), whose sum is σ = 82498729920. Its totient is φ = 80436261516.

The previous prime is 81467495699. The next prime is 81467495741. The reversal of 81467495717 is 71759476418.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81467495717 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 (81467491717) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 515616983 + ... + 515617140.

It is an arithmetic number, because the mean of its divisors is an integer number (20624682480).

Almost surely, 2^81467495717 is an apocalyptic number.

It is an amenable number.

81467495717 is a deficient number, since it is larger than the sum of its proper divisors (1031234203).

81467495717 is a wasteful number, since it uses less digits than its factorization.

81467495717 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1031234202.

The product of its digits is 11854080, while the sum is 59.

The spelling of 81467495717 in words is "eighty-one billion, four hundred sixty-seven million, four hundred ninety-five thousand, seven hundred seventeen".