6662121287 has 2 divisors, whose sum is σ = 6662121288. Its totient is φ = 6662121286.

The previous prime is 6662121269. The next prime is 6662121293. The reversal of 6662121287 is 7821212666.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6662121287 - 2⁶ = 6662121223 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6662121217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3331060643 + 3331060644.

It is an arithmetic number, because the mean of its divisors is an integer number (3331060644).

Almost surely, 2^6662121287 is an apocalyptic number.

6662121287 is a deficient number, since it is larger than the sum of its proper divisors (1).

6662121287 is an equidigital number, since it uses as much as digits as its factorization.

6662121287 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 96768, while the sum is 41.

The square root of 6662121287 is about 81621.8186945133. The cubic root of 6662121287 is about 1881.6442239108.

The spelling of 6662121287 in words is "six billion, six hundred sixty-two million, one hundred twenty-one thousand, two hundred eighty-seven".