205453505045 has 4 divisors (see below), whose sum is σ = 246544206060. Its totient is φ = 164362804032.

The previous prime is 205453504999. The next prime is 205453505053. The reversal of 205453505045 is 540505354502.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 21585780241 + 183867724804 = 146921^2 + 428798^2 .

It is a cyclic number.

It is not a de Polignac number, because 205453505045 - 2²⁴ = 205436727829 is a prime.

It is a super-2 number, since 2×205453505045² (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 3 ways as a sum of consecutive naturals, for example, 20545350500 + ... + 20545350509.

It is an arithmetic number, because the mean of its divisors is an integer number (61636051515).

Almost surely, 2^205453505045 is an apocalyptic number.

It is an amenable number.

205453505045 is a deficient number, since it is larger than the sum of its proper divisors (41090701015).

205453505045 is an equidigital number, since it uses as much as digits as its factorization.

205453505045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41090701014.

The product of its (nonzero) digits is 300000, while the sum is 38.

Adding to 205453505045 its reverse (540505354502), we get a palindrome (745958859547).

The spelling of 205453505045 in words is "two hundred five billion, four hundred fifty-three million, five hundred five thousand, forty-five".