1645222563 has 16 divisors (see below), whose sum is σ = 2438055840. Its totient is φ = 1096504992.

The previous prime is 1645222547. The next prime is 1645222567. The reversal of 1645222563 is 3652225461.

1645222563 is a `hidden beast` number, since 1 + 645 + 2 + 2 + 2 + 5 + 6 + 3 = 666.

It is not a de Polignac number, because 1645222563 - 2⁴ = 1645222547 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1645222567) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 128145 + ... + 140397.

It is an arithmetic number, because the mean of its divisors is an integer number (152378490).

Almost surely, 2^1645222563 is an apocalyptic number.

1645222563 is a deficient number, since it is larger than the sum of its proper divisors (792833277).

1645222563 is a wasteful number, since it uses less digits than its factorization.

1645222563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17235 (or 17229 counting only the distinct ones).

The product of its digits is 86400, while the sum is 36.

The square root of 1645222563 is about 40561.3432100072. The cubic root of 1645222563 is about 1180.5241765302.

The spelling of 1645222563 in words is "one billion, six hundred forty-five million, two hundred twenty-two thousand, five hundred sixty-three".