1643801164 has 24 divisors (see below), whose sum is σ = 3002832000. Its totient is φ = 786445440.

The previous prime is 1643801161. The next prime is 1643801261. The reversal of 1643801164 is 4611083461.

It is not an unprimeable number, because it can be changed into a prime (1643801161) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 63439 + ... + 85510.

It is an arithmetic number, because the mean of its divisors is an integer number (125118000).

Almost surely, 2^1643801164 is an apocalyptic number.

It is an amenable number.

1643801164 is a deficient number, since it is larger than the sum of its proper divisors (1359030836).

1643801164 is a wasteful number, since it uses less digits than its factorization.

1643801164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149073 (or 149071 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 34.

The square root of 1643801164 is about 40543.8178271361. The cubic root of 1643801164 is about 1180.1841051438.

The spelling of 1643801164 in words is "one billion, six hundred forty-three million, eight hundred one thousand, one hundred sixty-four".