36665021 has 2 divisors, whose sum is σ = 36665022. Its totient is φ = 36665020.

The previous prime is 36665011. The next prime is 36665047. The reversal of 36665021 is 12056663.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 36132121 + 532900 = 6011^2 + 730^2 .

It is a cyclic number.

It is not a de Polignac number, because 36665021 - 2²² = 32470717 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (36665011) 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 as a sum of consecutive naturals, namely, 18332510 + 18332511.

It is an arithmetic number, because the mean of its divisors is an integer number (18332511).

Almost surely, 2^36665021 is an apocalyptic number.

It is an amenable number.

36665021 is a deficient number, since it is larger than the sum of its proper divisors (1).

36665021 is an equidigital number, since it uses as much as digits as its factorization.

36665021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6480, while the sum is 29.

The square root of 36665021 is about 6055.1648202175. The cubic root of 36665021 is about 332.2135275398.

The spelling of 36665021 in words is "thirty-six million, six hundred sixty-five thousand, twenty-one".