205054640454 has 16 divisors (see below), whose sum is σ = 420111946800. Its totient is φ = 66684435840.

The previous prime is 205054640431. The next prime is 205054640491. The reversal of 205054640454 is 454046450502.

It is a super-2 number, since 2×205054640454² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 416777479 + ... + 416777970.

It is an arithmetic number, because the mean of its divisors is an integer number (26256996675).

Almost surely, 2^205054640454 is an apocalyptic number.

205054640454 is an abundant number, since it is smaller than the sum of its proper divisors (215057306346).

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

205054640454 is a wasteful number, since it uses less digits than its factorization.

205054640454 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 833555495.

The product of its (nonzero) digits is 384000, while the sum is 39.

The spelling of 205054640454 in words is "two hundred five billion, fifty-four million, six hundred forty thousand, four hundred fifty-four".