1645335253 has 2 divisors, whose sum is σ = 1645335254. Its totient is φ = 1645335252.

The previous prime is 1645335239. The next prime is 1645335283. The reversal of 1645335253 is 3525335461.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1621109169 + 24226084 = 40263^2 + 4922^2 .

It is a cyclic number.

It is not a de Polignac number, because 1645335253 - 2⁵ = 1645335221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1645335283) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 822667626 + 822667627.

It is an arithmetic number, because the mean of its divisors is an integer number (822667627).

Almost surely, 2^1645335253 is an apocalyptic number.

It is an amenable number.

1645335253 is a deficient number, since it is larger than the sum of its proper divisors (1).

1645335253 is an equidigital number, since it uses as much as digits as its factorization.

1645335253 is an evil number, because the sum of its binary digits is even.

The product of its digits is 162000, while the sum is 37.

The square root of 1645335253 is about 40562.7323167461. The cubic root of 1645335253 is about 1180.5511293642.

The spelling of 1645335253 in words is "one billion, six hundred forty-five million, three hundred thirty-five thousand, two hundred fifty-three".