205453571668 has 12 divisors (see below), whose sum is σ = 359640714580. Its totient is φ = 102699081792.

The previous prime is 205453571647. The next prime is 205453571699. The reversal of 205453571668 is 866175354502.

It can be written as a sum of positive squares in 2 ways, for example, as 69283715524 + 136169856144 = 263218^2 + 369012^2 .

It is a super-2 number, since 2×205453571668² (a number of 23 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (52) coincides with the sum of the digits of its distinct prime factors.

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, 6909321 + ... + 6938992.

Almost surely, 2^205453571668 is an apocalyptic number.

It is an amenable number.

205453571668 is a deficient number, since it is larger than the sum of its proper divisors (154187142912).

205453571668 is a wasteful number, since it uses less digits than its factorization.

205453571668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13852026 (or 13852024 counting only the distinct ones).

The product of its (nonzero) digits is 6048000, while the sum is 52.

The spelling of 205453571668 in words is "two hundred five billion, four hundred fifty-three million, five hundred seventy-one thousand, six hundred sixty-eight".