204661623 has 16 divisors (see below), whose sum is σ = 289879776. Its totient is φ = 127994880.

The previous prime is 204661621. The next prime is 204661669. The reversal of 204661623 is 326166402.

It is not a de Polignac number, because 204661623 - 2¹ = 204661621 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204661621) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9553 + ... + 22373.

It is an arithmetic number, because the mean of its divisors is an integer number (18117486).

Almost surely, 2^204661623 is an apocalyptic number.

204661623 is a deficient number, since it is larger than the sum of its proper divisors (85218153).

204661623 is a wasteful number, since it uses less digits than its factorization.

204661623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13154.

The product of its (nonzero) digits is 10368, while the sum is 30.

The square root of 204661623 is about 14305.9995456452. Note that the first 3 decimals coincide. The cubic root of 204661623 is about 589.3122533020.

The spelling of 204661623 in words is "two hundred four million, six hundred sixty-one thousand, six hundred twenty-three".