36806821209 has 12 divisors (see below), whose sum is σ = 53483766336. Its totient is φ = 24390946392.

The previous prime is 36806821189. The next prime is 36806821217. The reversal of 36806821209 is 90212860863.

36806821209 is a `hidden beast` number, since 368 + 0 + 6 + 82 + 1 + 209 = 666.

It is a de Polignac number, because none of the positive numbers 2^k-36806821209 is a prime.

It is a super-2 number, since 2×36806821209² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (36806861209) 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 11 ways as a sum of consecutive naturals, for example, 12242949 + ... + 12245954.

It is an arithmetic number, because the mean of its divisors is an integer number (4456980528).

Almost surely, 2^36806821209 is an apocalyptic number.

It is an amenable number.

36806821209 is a deficient number, since it is larger than the sum of its proper divisors (16676945127).

36806821209 is a wasteful number, since it uses less digits than its factorization.

36806821209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24489076 (or 24489073 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 45.

The spelling of 36806821209 in words is "thirty-six billion, eight hundred six million, eight hundred twenty-one thousand, two hundred nine".