1645444997023 has 2 divisors, whose sum is σ = 1645444997024. Its totient is φ = 1645444997022.

The previous prime is 1645444996999. The next prime is 1645444997039. The reversal of 1645444997023 is 3207994445461.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1645444997023 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1645444997093) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 822722498511 + 822722498512.

It is an arithmetic number, because the mean of its divisors is an integer number (822722498512).

Almost surely, 2^{1645444997023} is an apocalyptic number.

1645444997023 is a deficient number, since it is larger than the sum of its proper divisors (1).

1645444997023 is an equidigital number, since it uses as much as digits as its factorization.

1645444997023 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 26127360, while the sum is 58.

The spelling of 1645444997023 in words is "one trillion, six hundred forty-five billion, four hundred forty-four million, nine hundred ninety-seven thousand, twenty-three".