6669621476447 has 2 divisors, whose sum is σ = 6669621476448. Its totient is φ = 6669621476446.

The previous prime is 6669621476431. The next prime is 6669621476461. The reversal of 6669621476447 is 7446741269666.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6669621476447 - 2⁴ = 6669621476431 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6669621476477) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3334810738223 + 3334810738224.

It is an arithmetic number, because the mean of its divisors is an integer number (3334810738224).

Almost surely, 2^{6669621476447} is an apocalyptic number.

6669621476447 is a deficient number, since it is larger than the sum of its proper divisors (1).

6669621476447 is an equidigital number, since it uses as much as digits as its factorization.

6669621476447 is an evil number, because the sum of its binary digits is even.

The product of its digits is 438939648, while the sum is 68.

The spelling of 6669621476447 in words is "six trillion, six hundred sixty-nine billion, six hundred twenty-one million, four hundred seventy-six thousand, four hundred forty-seven".