1645163441 has 2 divisors, whose sum is σ = 1645163442. Its totient is φ = 1645163440.

The previous prime is 1645163357. The next prime is 1645163453. The reversal of 1645163441 is 1443615461.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1076102416 + 569061025 = 32804^2 + 23855^2 .

It is a cyclic number.

It is not a de Polignac number, because 1645163441 - 2¹⁴ = 1645147057 is a prime.

It is not a weakly prime, because it can be changed into another prime (1645163041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 822581720 + 822581721.

It is an arithmetic number, because the mean of its divisors is an integer number (822581721).

Almost surely, 2^1645163441 is an apocalyptic number.

It is an amenable number.

1645163441 is a deficient number, since it is larger than the sum of its proper divisors (1).

1645163441 is an equidigital number, since it uses as much as digits as its factorization.

1645163441 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 34560, while the sum is 35.

The square root of 1645163441 is about 40560.6144060960. The cubic root of 1645163441 is about 1180.5100354269.

The spelling of 1645163441 in words is "one billion, six hundred forty-five million, one hundred sixty-three thousand, four hundred forty-one".