36543615681 has 4 divisors (see below), whose sum is σ = 48724820912. Its totient is φ = 24362410452.

The previous prime is 36543615673. The next prime is 36543615697. The reversal of 36543615681 is 18651634563.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 36543615681 - 2³ = 36543615673 is a prime.

It is a super-2 number, since 2×36543615681² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 36543615681.

It is not an unprimeable number, because it can be changed into a prime (36543615881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6090602611 + ... + 6090602616.

It is an arithmetic number, because the mean of its divisors is an integer number (12181205228).

Almost surely, 2^36543615681 is an apocalyptic number.

It is an amenable number.

36543615681 is a deficient number, since it is larger than the sum of its proper divisors (12181205231).

36543615681 is a wasteful number, since it uses less digits than its factorization.

36543615681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12181205230.

The product of its digits is 1555200, while the sum is 48.

The spelling of 36543615681 in words is "thirty-six billion, five hundred forty-three million, six hundred fifteen thousand, six hundred eighty-one".