1659641364 has 72 divisors (see below), whose sum is σ = 4390069320. Its totient is φ = 528083712.

The previous prime is 1659641363. The next prime is 1659641381. The reversal of 1659641364 is 4631469561.

1659641364 is a `hidden beast` number, since 16 + 596 + 41 + 3 + 6 + 4 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 1265936400 + 393704964 = 35580^2 + 19842^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1659641363) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 58842 + ... + 82350.

It is an arithmetic number, because the mean of its divisors is an integer number (60973185).

Almost surely, 2^1659641364 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1659641364, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2195034660).

1659641364 is an abundant number, since it is smaller than the sum of its proper divisors (2730427956).

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

1659641364 is a wasteful number, since it uses less digits than its factorization.

1659641364 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23609 (or 23604 counting only the distinct ones).

The product of its digits is 466560, while the sum is 45.

The square root of 1659641364 is about 40738.6961499751. The cubic root of 1659641364 is about 1183.9628718650.

The spelling of 1659641364 in words is "one billion, six hundred fifty-nine million, six hundred forty-one thousand, three hundred sixty-four".