205054640457 has 16 divisors (see below), whose sum is σ = 274481074560. Its totient is φ = 136165784832.

The previous prime is 205054640431. The next prime is 205054640491. The reversal of 205054640457 is 754046450502.

It is not a de Polignac number, because 205054640457 - 2⁶ = 205054640393 is a prime.

It is not an unprimeable number, because it can be changed into a prime (205054640957) 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, 9675969 + ... + 9697137.

It is an arithmetic number, because the mean of its divisors is an integer number (17155067160).

Almost surely, 2^205054640457 is an apocalyptic number.

It is an amenable number.

205054640457 is a deficient number, since it is larger than the sum of its proper divisors (69426434103).

205054640457 is a wasteful number, since it uses less digits than its factorization.

205054640457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33712.

The product of its (nonzero) digits is 672000, while the sum is 42.

The spelling of 205054640457 in words is "two hundred five billion, fifty-four million, six hundred forty thousand, four hundred fifty-seven".