3599505666221 has 2 divisors, whose sum is σ = 3599505666222. Its totient is φ = 3599505666220.

The previous prime is 3599505666173. The next prime is 3599505666233. The reversal of 3599505666221 is 1226665059953.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3553790522500 + 45715143721 = 1885150^2 + 213811^2 .

It is an emirp because it is prime and its reverse (1226665059953) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3599505666221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3593505666221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1799752833110 + 1799752833111.

It is an arithmetic number, because the mean of its divisors is an integer number (1799752833111).

Almost surely, 2^{3599505666221} is an apocalyptic number.

It is an amenable number.

3599505666221 is a deficient number, since it is larger than the sum of its proper divisors (1).

3599505666221 is an equidigital number, since it uses as much as digits as its factorization.

3599505666221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 26244000, while the sum is 59.

The spelling of 3599505666221 in words is "three trillion, five hundred ninety-nine billion, five hundred five million, six hundred sixty-six thousand, two hundred twenty-one".