1643664522 has 16 divisors (see below), whose sum is σ = 3287813760. Its totient is φ = 547807392.

The previous prime is 1643664427. The next prime is 1643664541. The reversal of 1643664522 is 2254663461.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35854 + ... + 67622.

It is an arithmetic number, because the mean of its divisors is an integer number (205488360).

Almost surely, 2^1643664522 is an apocalyptic number.

1643664522 is an abundant number, since it is smaller than the sum of its proper divisors (1644149238).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1643664522 is a wasteful number, since it uses less digits than its factorization.

1643664522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40397.

The product of its digits is 207360, while the sum is 39.

The square root of 1643664522 is about 40542.1326770065. The cubic root of 1643664522 is about 1180.1514030570.

The spelling of 1643664522 in words is "one billion, six hundred forty-three million, six hundred sixty-four thousand, five hundred twenty-two".