1600661566 has 32 divisors (see below), whose sum is σ = 2814743232. Its totient is φ = 668355840.

The previous prime is 1600661549. The next prime is 1600661591. The reversal of 1600661566 is 6651660061.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 570880 + ... + 573676.

It is an arithmetic number, because the mean of its divisors is an integer number (87960726).

Almost surely, 2^1600661566 is an apocalyptic number.

1600661566 is a deficient number, since it is larger than the sum of its proper divisors (1214081666).

1600661566 is a wasteful number, since it uses less digits than its factorization.

1600661566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3844.

The product of its (nonzero) digits is 38880, while the sum is 37.

The square root of 1600661566 is about 40008.2687203533. The cubic root of 1600661566 is about 1169.7682756322.

The spelling of 1600661566 in words is "one billion, six hundred million, six hundred sixty-one thousand, five hundred sixty-six".