205680148594 has 4 divisors (see below), whose sum is σ = 308520222894. Its totient is φ = 102840074296.

The previous prime is 205680148559. The next prime is 205680148649. The reversal of 205680148594 is 495841086502.

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

It can be written as a sum of positive squares in only one way, i.e., 156549209569 + 49130939025 = 395663^2 + 221655^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51420037147 + ... + 51420037150.

Almost surely, 2^205680148594 is an apocalyptic number.

205680148594 is a deficient number, since it is larger than the sum of its proper divisors (102840074300).

205680148594 is a wasteful number, since it uses less digits than its factorization.

205680148594 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102840074299.

The product of its (nonzero) digits is 2764800, while the sum is 52.

The spelling of 205680148594 in words is "two hundred five billion, six hundred eighty million, one hundred forty-eight thousand, five hundred ninety-four".