1645332523 has 2 divisors, whose sum is σ = 1645332524. Its totient is φ = 1645332522.

The previous prime is 1645332497. The next prime is 1645332551. The reversal of 1645332523 is 3252335461.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1645332523 - 2⁹ = 1645332011 is a prime.

It is a super-3 number, since 3×1645332523³ (a number of 29 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not a weakly prime, because it can be changed into another prime (1645332553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 822666261 + 822666262.

It is an arithmetic number, because the mean of its divisors is an integer number (822666262).

Almost surely, 2^1645332523 is an apocalyptic number.

1645332523 is a deficient number, since it is larger than the sum of its proper divisors (1).

1645332523 is an equidigital number, since it uses as much as digits as its factorization.

1645332523 is an evil number, because the sum of its binary digits is even.

The product of its digits is 64800, while the sum is 34.

The square root of 1645332523 is about 40562.6986651529. The cubic root of 1645332523 is about 1180.5504764261.

Adding to 1645332523 its reverse (3252335461), we get a palindrome (4897667984).

The spelling of 1645332523 in words is "one billion, six hundred forty-five million, three hundred thirty-two thousand, five hundred twenty-three".