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7666621 is a prime number
BaseRepresentation
bin11101001111101110111101
3112102111121221
4131033232331
53430312441
6432153341
7122110444
oct35175675
915374557
107666621
114367056
122698851
131785781
141037d5b
15a168d1
hex74fbbd

7666621 has 2 divisors, whose sum is σ = 7666622. Its totient is φ = 7666620.

The previous prime is 7666619. The next prime is 7666639. The reversal of 7666621 is 1266667.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6200100 + 1466521 = 2490^2 + 1211^2 .

It is a cyclic number.

It is not a de Polignac number, because 7666621 - 21 = 7666619 is a prime.

Together with 7666619, it forms a pair of twin primes.

It is a nialpdrome in base 10.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7666661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3833310 + 3833311.

It is an arithmetic number, because the mean of its divisors is an integer number (3833311).

Almost surely, 27666621 is an apocalyptic number.

It is an amenable number.

7666621 is a deficient number, since it is larger than the sum of its proper divisors (1).

7666621 is an equidigital number, since it uses as much as digits as its factorization.

7666621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18144, while the sum is 34.

The square root of 7666621 is about 2768.8663745295. The cubic root of 7666621 is about 197.1823318149.

The spelling of 7666621 in words is "seven million, six hundred sixty-six thousand, six hundred twenty-one".