661163 has 4 divisors (see below), whose sum is σ = 667128. Its totient is φ = 655200.

The previous prime is 661139. The next prime is 661183. The reversal of 661163 is 361166.

661163 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 661163 - 2⁶ = 661099 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (661103) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2813 + ... + 3038.

It is an arithmetic number, because the mean of its divisors is an integer number (166782).

2⁶⁶¹¹⁶³ is an apocalyptic number.

661163 is a deficient number, since it is larger than the sum of its proper divisors (5965).

661163 is a wasteful number, since it uses less digits than its factorization.

661163 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5964.

The product of its digits is 648, while the sum is 23.

The square root of 661163 is about 813.1193024397. The cubic root of 661163 is about 87.1169871122.

The spelling of 661163 in words is "six hundred sixty-one thousand, one hundred sixty-three".