6669621476461 has 2 divisors, whose sum is σ = 6669621476462. Its totient is φ = 6669621476460.

The previous prime is 6669621476447. The next prime is 6669621476473. The reversal of 6669621476461 is 1646741269666.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3363519320100 + 3306102156361 = 1833990^2 + 1818269^2 .

It is a cyclic number.

It is not a de Polignac number, because 6669621476461 - 2⁹ = 6669621475949 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 6669621476393 and 6669621476402.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6669621476431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3334810738230 + 3334810738231.

It is an arithmetic number, because the mean of its divisors is an integer number (3334810738231).

Almost surely, 2^{6669621476461} is an apocalyptic number.

It is an amenable number.

6669621476461 is a deficient number, since it is larger than the sum of its proper divisors (1).

6669621476461 is an equidigital number, since it uses as much as digits as its factorization.

6669621476461 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 94058496, while the sum is 64.

The spelling of 6669621476461 in words is "six trillion, six hundred sixty-nine billion, six hundred twenty-one million, four hundred seventy-six thousand, four hundred sixty-one".