323212000021661 has 2 divisors, whose sum is σ = 323212000021662. Its totient is φ = 323212000021660.

The previous prime is 323212000021657. The next prime is 323212000021679. The reversal of 323212000021661 is 166120000212323.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 302822991276100 + 20389008745561 = 17401810^2 + 4515419^2 .

It is a cyclic number.

It is not a de Polignac number, because 323212000021661 - 2² = 323212000021657 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (323212000021061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 161606000010830 + 161606000010831.

It is an arithmetic number, because the mean of its divisors is an integer number (161606000010831).

Almost surely, 2^{323212000021661} is an apocalyptic number.

It is an amenable number.

323212000021661 is a deficient number, since it is larger than the sum of its proper divisors (1).

323212000021661 is an equidigital number, since it uses as much as digits as its factorization.

323212000021661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 29.

Adding to 323212000021661 its reverse (166120000212323), we get a palindrome (489332000233984).

The spelling of 323212000021661 in words is "three hundred twenty-three trillion, two hundred twelve billion, twenty-one thousand, six hundred sixty-one".