1648841657 has 2 divisors, whose sum is σ = 1648841658. Its totient is φ = 1648841656.

The previous prime is 1648841633. The next prime is 1648841681. The reversal of 1648841657 is 7561488461.

It is a balanced prime because it is at equal distance from previous prime (1648841633) and next prime (1648841681).

It can be written as a sum of positive squares in only one way, i.e., 1641546256 + 7295401 = 40516^2 + 2701^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1648841657 is a prime.

It is not a weakly prime, because it can be changed into another prime (1648841617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 824420828 + 824420829.

It is an arithmetic number, because the mean of its divisors is an integer number (824420829).

Almost surely, 2^1648841657 is an apocalyptic number.

It is an amenable number.

1648841657 is a deficient number, since it is larger than the sum of its proper divisors (1).

1648841657 is an equidigital number, since it uses as much as digits as its factorization.

1648841657 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1290240, while the sum is 50.

The square root of 1648841657 is about 40605.9313031976. The cubic root of 1648841657 is about 1181.3891656836.

The spelling of 1648841657 in words is "one billion, six hundred forty-eight million, eight hundred forty-one thousand, six hundred fifty-seven".