205545454 has 4 divisors (see below), whose sum is σ = 308318184. Its totient is φ = 102772726.

The previous prime is 205545449. The next prime is 205545467. The reversal of 205545454 is 454545502.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 454545502 = 2 ⋅227272751.

It is a super-2 number, since 2×205545454² = 84497867320132232, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51386362 + ... + 51386365.

It is an arithmetic number, because the mean of its divisors is an integer number (77079546).

Almost surely, 2^205545454 is an apocalyptic number.

205545454 is a deficient number, since it is larger than the sum of its proper divisors (102772730).

205545454 is a wasteful number, since it uses less digits than its factorization.

205545454 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102772729.

The product of its (nonzero) digits is 80000, while the sum is 34.

The square root of 205545454 is about 14336.8564894819. The cubic root of 205545454 is about 590.1593498530.

The spelling of 205545454 in words is "two hundred five million, five hundred forty-five thousand, four hundred fifty-four".