1659220764 has 12 divisors (see below), whose sum is σ = 3871515144. Its totient is φ = 553073584.

The previous prime is 1659220753. The next prime is 1659220811. The reversal of 1659220764 is 4670229561.

1659220764 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 69134187 + ... + 69134210.

It is an arithmetic number, because the mean of its divisors is an integer number (322626262).

Almost surely, 2^1659220764 is an apocalyptic number.

It is an amenable number.

1659220764 is an abundant number, since it is smaller than the sum of its proper divisors (2212294380).

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

1659220764 is a wasteful number, since it uses less digits than its factorization.

1659220764 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138268404 (or 138268402 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 42.

The square root of 1659220764 is about 40733.5336547175. The cubic root of 1659220764 is about 1183.8628468701.

The spelling of 1659220764 in words is "one billion, six hundred fifty-nine million, two hundred twenty thousand, seven hundred sixty-four".