2068649621 has 2 divisors, whose sum is σ = 2068649622. Its totient is φ = 2068649620.

The previous prime is 2068649617. The next prime is 2068649657. The reversal of 2068649621 is 1269468602.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2051093521 + 17556100 = 45289^2 + 4190^2 .

It is a cyclic number.

It is not a de Polignac number, because 2068649621 - 2² = 2068649617 is a prime.

It is a super-2 number, since 2×2068649621² = 8558622508926887282, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2068649521) 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, 1034324810 + 1034324811.

It is an arithmetic number, because the mean of its divisors is an integer number (1034324811).

Almost surely, 2^2068649621 is an apocalyptic number.

It is an amenable number.

2068649621 is a deficient number, since it is larger than the sum of its proper divisors (1).

2068649621 is an equidigital number, since it uses as much as digits as its factorization.

2068649621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 248832, while the sum is 44.

The square root of 2068649621 is about 45482.4100175002. The cubic root of 2068649621 is about 1274.1747053824.

It can be divided in two parts, 20686 and 49621, that added together give a palindrome (70307).

The spelling of 2068649621 in words is "two billion, sixty-eight million, six hundred forty-nine thousand, six hundred twenty-one".