2068649657 has 2 divisors, whose sum is σ = 2068649658. Its totient is φ = 2068649656.

The previous prime is 2068649621. The next prime is 2068649669. The reversal of 2068649657 is 7569468602.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1106161081 + 962488576 = 33259^2 + 31024^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2068649657 is a prime.

It is a super-2 number, since 2×2068649657² = 8558622806812435298, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2068649599 and 2068649608.

It is not a weakly prime, because it can be changed into another prime (2068649617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1034324828 + 1034324829.

It is an arithmetic number, because the mean of its divisors is an integer number (1034324829).

Almost surely, 2^2068649657 is an apocalyptic number.

It is an amenable number.

2068649657 is a deficient number, since it is larger than the sum of its proper divisors (1).

2068649657 is an equidigital number, since it uses as much as digits as its factorization.

2068649657 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4354560, while the sum is 53.

The square root of 2068649657 is about 45482.4104132576. The cubic root of 2068649657 is about 1274.1747127737.

The spelling of 2068649657 in words is "two billion, sixty-eight million, six hundred forty-nine thousand, six hundred fifty-seven".