1645222564 has 12 divisors (see below), whose sum is σ = 2880323824. Its totient is φ = 822272904.

The previous prime is 1645222547. The next prime is 1645222567. The reversal of 1645222564 is 4652225461.

It is a happy number.

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

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 73494 + ... + 93229.

Almost surely, 2^1645222564 is an apocalyptic number.

It is an amenable number.

1645222564 is a deficient number, since it is larger than the sum of its proper divisors (1235101260).

1645222564 is a wasteful number, since it uses less digits than its factorization.

1645222564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169194 (or 169192 counting only the distinct ones).

The product of its digits is 115200, while the sum is 37.

The square root of 1645222564 is about 40561.3432223342. The cubic root of 1645222564 is about 1180.5241767694.

The spelling of 1645222564 in words is "one billion, six hundred forty-five million, two hundred twenty-two thousand, five hundred sixty-four".