205613907189 has 16 divisors (see below), whose sum is σ = 292941570240. Its totient is φ = 127829041920.

The previous prime is 205613907157. The next prime is 205613907217. The reversal of 205613907189 is 981709316502.

It is not a de Polignac number, because 205613907189 - 2⁵ = 205613907157 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205613907689) 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, 18488227 + ... + 18499344.

It is an arithmetic number, because the mean of its divisors is an integer number (18308848140).

Almost surely, 2^205613907189 is an apocalyptic number.

It is an amenable number.

205613907189 is a deficient number, since it is larger than the sum of its proper divisors (87327663051).

205613907189 is a wasteful number, since it uses less digits than its factorization.

205613907189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36987700.

The product of its (nonzero) digits is 816480, while the sum is 51.

The spelling of 205613907189 in words is "two hundred five billion, six hundred thirteen million, nine hundred seven thousand, one hundred eighty-nine".