86535772129 has 4 divisors (see below), whose sum is σ = 91626111684. Its totient is φ = 81445432576.

The previous prime is 86535772051. The next prime is 86535772157. The reversal of 86535772129 is 92127753568.

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 78538941504 + 7996830625 = 280248^2 + 89425^2 .

It is a cyclic number.

It is not a de Polignac number, because 86535772129 - 2²¹ = 86533674977 is a prime.

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 86535772129.

It is not an unprimeable number, because it can be changed into a prime (86535772189) 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, 2545169752 + ... + 2545169785.

It is an arithmetic number, because the mean of its divisors is an integer number (22906527921).

Almost surely, 2^86535772129 is an apocalyptic number.

It is an amenable number.

86535772129 is a deficient number, since it is larger than the sum of its proper divisors (5090339555).

86535772129 is a wasteful number, since it uses less digits than its factorization.

86535772129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5090339554.

The product of its digits is 6350400, while the sum is 55.

The spelling of 86535772129 in words is "eighty-six billion, five hundred thirty-five million, seven hundred seventy-two thousand, one hundred twenty-nine".