81790173735 has 8 divisors (see below), whose sum is σ = 130864278000. Its totient is φ = 43621425984.

The previous prime is 81790173733. The next prime is 81790173737. The reversal of 81790173735 is 53737109718.

It is an interprime number because it is at equal distance from previous prime (81790173733) and next prime (81790173737).

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

It is not a de Polignac number, because 81790173735 - 2¹ = 81790173733 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81790173733) 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, 2726339110 + ... + 2726339139.

It is an arithmetic number, because the mean of its divisors is an integer number (16358034750).

Almost surely, 2^81790173735 is an apocalyptic number.

81790173735 is a deficient number, since it is larger than the sum of its proper divisors (49074104265).

81790173735 is a wasteful number, since it uses less digits than its factorization.

81790173735 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5452678257.

The product of its (nonzero) digits is 1111320, while the sum is 51.

The spelling of 81790173735 in words is "eighty-one billion, seven hundred ninety million, one hundred seventy-three thousand, seven hundred thirty-five".