1643145564 has 24 divisors (see below), whose sum is σ = 3835520640. Its totient is φ = 547498864.

The previous prime is 1643145547. The next prime is 1643145577. The reversal of 1643145564 is 4655413461.

It is a congruent number.

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, 6247 + ... + 57665.

It is an arithmetic number, because the mean of its divisors is an integer number (159813360).

Almost surely, 2^1643145564 is an apocalyptic number.

It is an amenable number.

1643145564 is an abundant number, since it is smaller than the sum of its proper divisors (2192375076).

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

1643145564 is a wasteful number, since it uses less digits than its factorization.

1643145564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54089 (or 54087 counting only the distinct ones).

The product of its digits is 172800, while the sum is 39.

The square root of 1643145564 is about 40535.7319410912. The cubic root of 1643145564 is about 1180.0271860059.

The spelling of 1643145564 in words is "one billion, six hundred forty-three million, one hundred forty-five thousand, five hundred sixty-four".