3456005221661 has 2 divisors, whose sum is σ = 3456005221662. Its totient is φ = 3456005221660.

The previous prime is 3456005221657. The next prime is 3456005221699. The reversal of 3456005221661 is 1661225006543.

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., 2069840425636 + 1386164796025 = 1438694^2 + 1177355^2 .

It is a cyclic number.

It is not a de Polignac number, because 3456005221661 - 2² = 3456005221657 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3456005221601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1728002610830 + 1728002610831.

It is an arithmetic number, because the mean of its divisors is an integer number (1728002610831).

Almost surely, 2^{3456005221661} is an apocalyptic number.

It is an amenable number.

3456005221661 is a deficient number, since it is larger than the sum of its proper divisors (1).

3456005221661 is an equidigital number, since it uses as much as digits as its factorization.

3456005221661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 259200, while the sum is 41.

The spelling of 3456005221661 in words is "three trillion, four hundred fifty-six billion, five million, two hundred twenty-one thousand, six hundred sixty-one".