36531266521 has 4 divisors (see below), whose sum is σ = 36578526372. Its totient is φ = 36484006672.

The previous prime is 36531266509. The next prime is 36531266537. The reversal of 36531266521 is 12566213563.

36531266521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12566213563 = 227 ⋅55357769.

It can be written as a sum of positive squares in 2 ways, for example, as 15153610000 + 21377656521 = 123100^2 + 146211^2 .

It is a cyclic number.

It is not a de Polignac number, because 36531266521 - 2¹³ = 36531258329 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (36531266591) 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, 23628766 + ... + 23630311.

It is an arithmetic number, because the mean of its divisors is an integer number (9144631593).

Almost surely, 2^36531266521 is an apocalyptic number.

It is an amenable number.

36531266521 is a deficient number, since it is larger than the sum of its proper divisors (47259851).

36531266521 is an equidigital number, since it uses as much as digits as its factorization.

36531266521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47259850.

The product of its digits is 194400, while the sum is 40.

The spelling of 36531266521 in words is "thirty-six billion, five hundred thirty-one million, two hundred sixty-six thousand, five hundred twenty-one".