643600156 has 6 divisors (see below), whose sum is σ = 1126300280. Its totient is φ = 321800076.

The previous prime is 643600051. The next prime is 643600169. The reversal of 643600156 is 651006346.

643600156 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80450016 + ... + 80450023.

Almost surely, 2^643600156 is an apocalyptic number.

It is an amenable number.

643600156 is a deficient number, since it is larger than the sum of its proper divisors (482700124).

643600156 is a wasteful number, since it uses less digits than its factorization.

643600156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160900043 (or 160900041 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 31.

The square root of 643600156 is about 25369.2758272679. The cubic root of 643600156 is about 863.3867515466.

The spelling of 643600156 in words is "six hundred forty-three million, six hundred thousand, one hundred fifty-six".