2606221997 has 2 divisors, whose sum is σ = 2606221998. Its totient is φ = 2606221996.

The previous prime is 2606221979. The next prime is 2606221999. The reversal of 2606221997 is 7991226062.

Together with previous prime (2606221979) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2395710916 + 210511081 = 48946^2 + 14509^2 .

It is a cyclic number.

It is not a de Polignac number, because 2606221997 - 2⁸ = 2606221741 is a prime.

Together with 2606221999, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2606221999) 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, 1303110998 + 1303110999.

It is an arithmetic number, because the mean of its divisors is an integer number (1303110999).

Almost surely, 2^2606221997 is an apocalyptic number.

It is an amenable number.

2606221997 is a deficient number, since it is larger than the sum of its proper divisors (1).

2606221997 is an equidigital number, since it uses as much as digits as its factorization.

2606221997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 163296, while the sum is 44.

The square root of 2606221997 is about 51051.1703783567. The cubic root of 2606221997 is about 1376.1648745911.

The spelling of 2606221997 in words is "two billion, six hundred six million, two hundred twenty-one thousand, nine hundred ninety-seven".