1606556646 has 32 divisors (see below), whose sum is σ = 3572121600. Its totient is φ = 535219560.

The previous prime is 1606556641. The next prime is 1606556657. The reversal of 1606556646 is 6466556061.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1606556641) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 102811 + ... + 117401.

It is an arithmetic number, because the mean of its divisors is an integer number (111628800).

Almost surely, 2^1606556646 is an apocalyptic number.

1606556646 is an abundant number, since it is smaller than the sum of its proper divisors (1965564954).

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

1606556646 is a wasteful number, since it uses less digits than its factorization.

1606556646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16641 (or 16635 counting only the distinct ones).

The product of its (nonzero) digits is 777600, while the sum is 45.

The square root of 1606556646 is about 40081.8742825233. The cubic root of 1606556646 is about 1171.2025636743.

The spelling of 1606556646 in words is "one billion, six hundred six million, five hundred fifty-six thousand, six hundred forty-six".