36406646621 has 4 divisors (see below), whose sum is σ = 36410396892. Its totient is φ = 36402896352.

The previous prime is 36406646609. The next prime is 36406646629. The reversal of 36406646621 is 12664660463.

It is a happy number.

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 31680084121 + 4726562500 = 177989^2 + 68750^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-36406646621 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (36406646629) 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, 1860536 + ... + 1880001.

It is an arithmetic number, because the mean of its divisors is an integer number (9102599223).

Almost surely, 2^36406646621 is an apocalyptic number.

It is an amenable number.

36406646621 is a deficient number, since it is larger than the sum of its proper divisors (3750271).

36406646621 is an equidigital number, since it uses as much as digits as its factorization.

36406646621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3750270.

The product of its (nonzero) digits is 746496, while the sum is 44.

The spelling of 36406646621 in words is "thirty-six billion, four hundred six million, six hundred forty-six thousand, six hundred twenty-one".