205904889157 has 16 divisors (see below), whose sum is σ = 226428333120. Its totient is φ = 185683388800.

The previous prime is 205904889149. The next prime is 205904889163. The reversal of 205904889157 is 751988409502.

It is a cyclic number.

It is not a de Polignac number, because 205904889157 - 2³ = 205904889149 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205904889137) 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, 3767019 + ... + 3821287.

It is an arithmetic number, because the mean of its divisors is an integer number (14151770820).

Almost surely, 2^205904889157 is an apocalyptic number.

It is an amenable number.

205904889157 is a deficient number, since it is larger than the sum of its proper divisors (20523443963).

205904889157 is a wasteful number, since it uses less digits than its factorization.

205904889157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57044.

The product of its (nonzero) digits is 7257600, while the sum is 58.

The spelling of 205904889157 in words is "two hundred five billion, nine hundred four million, eight hundred eighty-nine thousand, one hundred fifty-seven".