86575233821 has 4 divisors (see below), whose sum is σ = 91667894652. Its totient is φ = 81482572992.

The previous prime is 86575233817. The next prime is 86575233847. The reversal of 86575233821 is 12833257568.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 42050013721 + 44525220100 = 205061^2 + 211010^2 .

It is a cyclic number.

It is not a de Polignac number, because 86575233821 - 2² = 86575233817 is a prime.

It is a super-2 number, since 2×86575233821² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 86575233821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (86575233221) 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, 2546330390 + ... + 2546330423.

It is an arithmetic number, because the mean of its divisors is an integer number (22916973663).

Almost surely, 2^86575233821 is an apocalyptic number.

It is an amenable number.

86575233821 is a deficient number, since it is larger than the sum of its proper divisors (5092660831).

86575233821 is a wasteful number, since it uses less digits than its factorization.

86575233821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5092660830.

The product of its digits is 2419200, while the sum is 50.

The spelling of 86575233821 in words is "eighty-six billion, five hundred seventy-five million, two hundred thirty-three thousand, eight hundred twenty-one".