205054638408 has 24 divisors (see below), whose sum is σ = 555356312550. Its totient is φ = 68351546112.

The previous prime is 205054638407. The next prime is 205054638421. The reversal of 205054638408 is 804836450502.

205054638408 is a `hidden beast` number, since 2 + 0 + 5 + 0 + 5 + 4 + 638 + 4 + 0 + 8 = 666.

It can be written as a sum of positive squares in only one way, i.e., 141287277924 + 63767360484 = 375882^2 + 252522^2 .

It is a tau number, because it is divible by the number of its divisors (24).

It is not an unprimeable number, because it can be changed into a prime (205054638407) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1423990473 + ... + 1423990616.

Almost surely, 2^205054638408 is an apocalyptic number.

It is an amenable number.

205054638408 is an abundant number, since it is smaller than the sum of its proper divisors (350301674142).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

205054638408 is a wasteful number, since it uses less digits than its factorization.

205054638408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2847981101 (or 2847981094 counting only the distinct ones).

The product of its (nonzero) digits is 921600, while the sum is 45.

The spelling of 205054638408 in words is "two hundred five billion, fifty-four million, six hundred thirty-eight thousand, four hundred eight".