36681125681 has 4 divisors (see below), whose sum is σ = 36833329764. Its totient is φ = 36528921600.

The previous prime is 36681125671. The next prime is 36681125711. The reversal of 36681125681 is 18652118663.

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 13093080625 + 23588045056 = 114425^2 + 153584^2 .

It is a cyclic number.

It is not a de Polignac number, because 36681125681 - 2⁶ = 36681125617 is a prime.

It is a super-2 number, since 2×36681125681² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (36681125671) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 76101680 + ... + 76102161.

It is an arithmetic number, because the mean of its divisors is an integer number (9208332441).

Almost surely, 2^36681125681 is an apocalyptic number.

It is an amenable number.

36681125681 is a deficient number, since it is larger than the sum of its proper divisors (152204083).

36681125681 is a wasteful number, since it uses less digits than its factorization.

36681125681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152204082.

The product of its digits is 414720, while the sum is 47.

The spelling of 36681125681 in words is "thirty-six billion, six hundred eighty-one million, one hundred twenty-five thousand, six hundred eighty-one".