81675697597 has 8 divisors (see below), whose sum is σ = 88865233016. Its totient is φ = 74615703552.

The previous prime is 81675697591. The next prime is 81675697603. The reversal of 81675697597 is 79579657618.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (81675697591) and next prime (81675697603).

It can be written as a sum of positive squares in 4 ways, for example, as 20363004601 + 61312692996 = 142699^2 + 247614^2 .

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

It is not a de Polignac number, because 81675697597 - 2³ = 81675697589 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 (81675697591) 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, 32384028 + ... + 32386549.

It is an arithmetic number, because the mean of its divisors is an integer number (11108154127).

Almost surely, 2^81675697597 is an apocalyptic number.

It is an amenable number.

81675697597 is a deficient number, since it is larger than the sum of its proper divisors (7189535419).

81675697597 is a wasteful number, since it uses less digits than its factorization.

81675697597 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64770687.

The product of its digits is 200037600, while the sum is 70.

The spelling of 81675697597 in words is "eighty-one billion, six hundred seventy-five million, six hundred ninety-seven thousand, five hundred ninety-seven".