1643253606 has 12 divisors (see below), whose sum is σ = 3560382852. Its totient is φ = 547751196.

The previous prime is 1643253581. The next prime is 1643253617. The reversal of 1643253606 is 6063523461.

1643253606 is a `hidden beast` number, since 1 + 6 + 43 + 2 + 5 + 3 + 606 = 666.

1643253606 is digitally balanced in base 4, 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 in 5 ways as a sum of consecutive naturals, for example, 45645916 + ... + 45645951.

It is an arithmetic number, because the mean of its divisors is an integer number (296698571).

Almost surely, 2^1643253606 is an apocalyptic number.

1643253606 is an abundant number, since it is smaller than the sum of its proper divisors (1917129246).

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

1643253606 is a wasteful number, since it uses less digits than its factorization.

1643253606 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91291875 (or 91291872 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 36.

The square root of 1643253606 is about 40537.0645952565. The cubic root of 1643253606 is about 1180.0530489413.

The spelling of 1643253606 in words is "one billion, six hundred forty-three million, two hundred fifty-three thousand, six hundred six".