81595302373 has 8 divisors (see below), whose sum is σ = 93040797528. Its totient is φ = 70888226304.

The previous prime is 81595302329. The next prime is 81595302377. The reversal of 81595302373 is 37320359518.

It can be written as a sum of positive squares in 4 ways, for example, as 7294355649 + 74300946724 = 85407^2 + 272582^2 .

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 81595302373 - 2²⁵ = 81561747941 is a prime.

It is a super-2 number, since 2×81595302373² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81595302377) 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, 184604536 + ... + 184604977.

It is an arithmetic number, because the mean of its divisors is an integer number (11630099691).

Almost surely, 2^81595302373 is an apocalyptic number.

It is an amenable number.

81595302373 is a deficient number, since it is larger than the sum of its proper divisors (11445495155).

81595302373 is a wasteful number, since it uses less digits than its factorization.

81595302373 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 369209543.

The product of its (nonzero) digits is 680400, while the sum is 46.

The spelling of 81595302373 in words is "eighty-one billion, five hundred ninety-five million, three hundred two thousand, three hundred seventy-three".