3613970768921 has 2 divisors, whose sum is σ = 3613970768922. Its totient is φ = 3613970768920.

The previous prime is 3613970768909. The next prime is 3613970768953. The reversal of 3613970768921 is 1298670793163.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3047691943696 + 566278825225 = 1745764^2 + 752515^2 .

It is a cyclic number.

It is not a de Polignac number, because 3613970768921 - 2⁶ = 3613970768857 is a prime.

It is not a weakly prime, because it can be changed into another prime (3613970768521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1806985384460 + 1806985384461.

It is an arithmetic number, because the mean of its divisors is an integer number (1806985384461).

Almost surely, 2^{3613970768921} is an apocalyptic number.

It is an amenable number.

3613970768921 is a deficient number, since it is larger than the sum of its proper divisors (1).

3613970768921 is an equidigital number, since it uses as much as digits as its factorization.

3613970768921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20575296, while the sum is 62.

The spelling of 3613970768921 in words is "three trillion, six hundred thirteen billion, nine hundred seventy million, seven hundred sixty-eight thousand, nine hundred twenty-one".