1683145657 has 2 divisors, whose sum is σ = 1683145658. Its totient is φ = 1683145656.

The previous prime is 1683145619. The next prime is 1683145669. The reversal of 1683145657 is 7565413861.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1333418256 + 349727401 = 36516^2 + 18701^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1683145657 is a prime.

It is not a weakly prime, because it can be changed into another prime (1683145697) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 841572828 + 841572829.

It is an arithmetic number, because the mean of its divisors is an integer number (841572829).

Almost surely, 2^1683145657 is an apocalyptic number.

It is an amenable number.

1683145657 is a deficient number, since it is larger than the sum of its proper divisors (1).

1683145657 is an equidigital number, since it uses as much as digits as its factorization.

1683145657 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 604800, while the sum is 46.

The square root of 1683145657 is about 41026.1582042482. The cubic root of 1683145657 is about 1189.5258938055.

The spelling of 1683145657 in words is "one billion, six hundred eighty-three million, one hundred forty-five thousand, six hundred fifty-seven".