205838245636 has 27 divisors (see below), whose sum is σ = 370276040757. Its totient is φ = 100121191920.

The previous prime is 205838245621. The next prime is 205838245667. The reversal of 205838245636 is 636542838502.

The square root of 205838245636 is 453694.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 184186888900 + 21651356736 = 429170^2 + 147144^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 33570291 + ... + 33576421.

Almost surely, 2^205838245636 is an apocalyptic number.

205838245636 is the 453694-th square number.

It is an amenable number.

205838245636 is a deficient number, since it is larger than the sum of its proper divisors (164437795121).

205838245636 is an frugal number, since it uses more digits than its factorization.

205838245636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12340 (or 6170 counting only the distinct ones).

The product of its (nonzero) digits is 8294400, while the sum is 52.

The spelling of 205838245636 in words is "two hundred five billion, eight hundred thirty-eight million, two hundred forty-five thousand, six hundred thirty-six".