6656060071621 has 2 divisors, whose sum is σ = 6656060071622. Its totient is φ = 6656060071620.

The previous prime is 6656060071589. The next prime is 6656060071673. The reversal of 6656060071621 is 1261700606566.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6091887830625 + 564172240996 = 2468175^2 + 751114^2 .

It is a cyclic number.

It is not a de Polignac number, because 6656060071621 - 2⁵ = 6656060071589 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6656060071421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3328030035810 + 3328030035811.

It is an arithmetic number, because the mean of its divisors is an integer number (3328030035811).

Almost surely, 2^{6656060071621} is an apocalyptic number.

It is an amenable number.

6656060071621 is a deficient number, since it is larger than the sum of its proper divisors (1).

6656060071621 is an equidigital number, since it uses as much as digits as its factorization.

6656060071621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 544320, while the sum is 46.

The spelling of 6656060071621 in words is "six trillion, six hundred fifty-six billion, sixty million, seventy-one thousand, six hundred twenty-one".