1643357564 has 12 divisors (see below), whose sum is σ = 3045045024. Its totient is φ = 773344704.

The previous prime is 1643357563. The next prime is 1643357579. The reversal of 1643357564 is 4657533461.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1643357563) 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, 12083444 + ... + 12083579.

It is an arithmetic number, because the mean of its divisors is an integer number (253753752).

Almost surely, 2^1643357564 is an apocalyptic number.

It is an amenable number.

1643357564 is a deficient number, since it is larger than the sum of its proper divisors (1401687460).

1643357564 is a wasteful number, since it uses less digits than its factorization.

1643357564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24167044 (or 24167042 counting only the distinct ones).

The product of its digits is 907200, while the sum is 44.

The square root of 1643357564 is about 40538.3468335846. The cubic root of 1643357564 is about 1180.0779331847.

The spelling of 1643357564 in words is "one billion, six hundred forty-three million, three hundred fifty-seven thousand, five hundred sixty-four".