205118209972 has 24 divisors (see below), whose sum is σ = 387578290176. Its totient is φ = 94422753888.

The previous prime is 205118209957. The next prime is 205118209973. The reversal of 205118209972 is 279902811502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205118209973) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5129668 + ... + 5169499.

It is an arithmetic number, because the mean of its divisors is an integer number (16149095424).

Almost surely, 2^205118209972 is an apocalyptic number.

It is an amenable number.

205118209972 is a deficient number, since it is larger than the sum of its proper divisors (182460080204).

205118209972 is a wasteful number, since it uses less digits than its factorization.

205118209972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10299567 (or 10299565 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 46.

The spelling of 205118209972 in words is "two hundred five billion, one hundred eighteen million, two hundred nine thousand, nine hundred seventy-two".