204428055956457 has 4 divisors (see below), whose sum is σ = 272570741275280. Its totient is φ = 136285370637636.

The previous prime is 204428055956407. The next prime is 204428055956477. The reversal of 204428055956457 is 754659550824402.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 204428055956457 - 2¹⁹ = 204428055432169 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (204428055956407) 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, 34071342659407 + ... + 34071342659412.

It is an arithmetic number, because the mean of its divisors is an integer number (68142685318820).

Almost surely, 2^{204428055956457} is an apocalyptic number.

It is an amenable number.

204428055956457 is a deficient number, since it is larger than the sum of its proper divisors (68142685318823).

204428055956457 is an equidigital number, since it uses as much as digits as its factorization.

204428055956457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68142685318822.

The product of its (nonzero) digits is 483840000, while the sum is 66.

The spelling of 204428055956457 in words is "two hundred four trillion, four hundred twenty-eight billion, fifty-five million, nine hundred fifty-six thousand, four hundred fifty-seven".