1645933490473 has 2 divisors, whose sum is σ = 1645933490474. Its totient is φ = 1645933490472.

The previous prime is 1645933490431. The next prime is 1645933490477. The reversal of 1645933490473 is 3740943395461.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1327491100224 + 318442390249 = 1152168^2 + 564307^2 .

It is an emirp because it is prime and its reverse (3740943395461) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1645933490473 - 2²⁵ = 1645899936041 is a prime.

It is not a weakly prime, because it can be changed into another prime (1645933490477) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 822966745236 + 822966745237.

It is an arithmetic number, because the mean of its divisors is an integer number (822966745237).

Almost surely, 2^{1645933490473} is an apocalyptic number.

It is an amenable number.

1645933490473 is a deficient number, since it is larger than the sum of its proper divisors (1).

1645933490473 is an equidigital number, since it uses as much as digits as its factorization.

1645933490473 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 29393280, while the sum is 58.

The spelling of 1645933490473 in words is "one trillion, six hundred forty-five billion, nine hundred thirty-three million, four hundred ninety thousand, four hundred seventy-three".