1661600766 has 32 divisors (see below), whose sum is σ = 3799922688. Its totient is φ = 474495840.

The previous prime is 1661600741. The next prime is 1661600779. The reversal of 1661600766 is 6670061661.

It is a Curzon number.

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, 80776 + ... + 99236.

It is an arithmetic number, because the mean of its divisors is an integer number (118747584).

Almost surely, 2^1661600766 is an apocalyptic number.

1661600766 is an abundant number, since it is smaller than the sum of its proper divisors (2138321922).

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

1661600766 is a wasteful number, since it uses less digits than its factorization.

1661600766 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20616.

The product of its (nonzero) digits is 54432, while the sum is 39.

The square root of 1661600766 is about 40762.7374694095. The cubic root of 1661600766 is about 1184.4286244692.

The spelling of 1661600766 in words is "one billion, six hundred sixty-one million, six hundred thousand, seven hundred sixty-six".