661593 has 8 divisors (see below), whose sum is σ = 893088. Its totient is φ = 435584.

The previous prime is 661553. The next prime is 661603. The reversal of 661593 is 395166.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 661593 - 2¹² = 657497 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 661593.

It is not an unprimeable number, because it can be changed into a prime (661513) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1080 + ... + 1577.

It is an arithmetic number, because the mean of its divisors is an integer number (111636).

2⁶⁶¹⁵⁹³ is an apocalyptic number.

It is an amenable number.

661593 is a deficient number, since it is larger than the sum of its proper divisors (231495).

661593 is a wasteful number, since it uses less digits than its factorization.

661593 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2743.

The product of its digits is 4860, while the sum is 30.

The square root of 661593 is about 813.3836733055. The cubic root of 661593 is about 87.1358690855.

The spelling of 661593 in words is "six hundred sixty-one thousand, five hundred ninety-three".