1645677073 has 2 divisors, whose sum is σ = 1645677074. Its totient is φ = 1645677072.

The previous prime is 1645677053. The next prime is 1645677079. The reversal of 1645677073 is 3707765461.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 991494144 + 654182929 = 31488^2 + 25577^2 .

It is a cyclic number.

It is not a de Polignac number, because 1645677073 - 2²¹ = 1643579921 is a prime.

It is not a weakly prime, because it can be changed into another prime (1645677079) 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, 822838536 + 822838537.

It is an arithmetic number, because the mean of its divisors is an integer number (822838537).

Almost surely, 2^1645677073 is an apocalyptic number.

It is an amenable number.

1645677073 is a deficient number, since it is larger than the sum of its proper divisors (1).

1645677073 is an equidigital number, since it uses as much as digits as its factorization.

1645677073 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 740880, while the sum is 46.

The square root of 1645677073 is about 40566.9455714871. The cubic root of 1645677073 is about 1180.6328772521.

The spelling of 1645677073 in words is "one billion, six hundred forty-five million, six hundred seventy-seven thousand, seventy-three".