4045021657 has 2 divisors, whose sum is σ = 4045021658. Its totient is φ = 4045021656.

The previous prime is 4045021637. The next prime is 4045021679. The reversal of 4045021657 is 7561205404.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3463440201 + 581581456 = 58851^2 + 24116^2 .

It is a cyclic number.

It is not a de Polignac number, because 4045021657 - 2²⁷ = 3910803929 is a prime.

It is not a weakly prime, because it can be changed into another prime (4045021627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2022510828 + 2022510829.

It is an arithmetic number, because the mean of its divisors is an integer number (2022510829).

Almost surely, 2^4045021657 is an apocalyptic number.

It is an amenable number.

4045021657 is a deficient number, since it is larger than the sum of its proper divisors (1).

4045021657 is an equidigital number, since it uses as much as digits as its factorization.

4045021657 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 33600, while the sum is 34.

The square root of 4045021657 is about 63600.4847229956. The cubic root of 4045021657 is about 1593.3344651356.

The spelling of 4045021657 in words is "four billion, forty-five million, twenty-one thousand, six hundred fifty-seven".