1648660757 has 2 divisors, whose sum is σ = 1648660758. Its totient is φ = 1648660756.

The previous prime is 1648660753. The next prime is 1648660823. The reversal of 1648660757 is 7570668461.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1132053316 + 516607441 = 33646^2 + 22729^2 .

It is a cyclic number.

It is not a de Polignac number, because 1648660757 - 2² = 1648660753 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1648660751) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 824330378 + 824330379.

It is an arithmetic number, because the mean of its divisors is an integer number (824330379).

Almost surely, 2^1648660757 is an apocalyptic number.

It is an amenable number.

1648660757 is a deficient number, since it is larger than the sum of its proper divisors (1).

1648660757 is an equidigital number, since it uses as much as digits as its factorization.

1648660757 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1693440, while the sum is 50.

The square root of 1648660757 is about 40603.7037350043. The cubic root of 1648660757 is about 1181.3459593685.

The spelling of 1648660757 in words is "one billion, six hundred forty-eight million, six hundred sixty thousand, seven hundred fifty-seven".