205330215931 has 4 divisors (see below), whose sum is σ = 205350120664. Its totient is φ = 205310311200.

The previous prime is 205330215929. The next prime is 205330215973. The reversal of 205330215931 is 139512033502.

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

It is a cyclic number.

It is not a de Polignac number, because 205330215931 - 2¹ = 205330215929 is a prime.

It is a super-2 number, since 2×205330215931² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (205330215991) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9936885 + ... + 9957526.

It is an arithmetic number, because the mean of its divisors is an integer number (51337530166).

Almost surely, 2^205330215931 is an apocalyptic number.

205330215931 is a deficient number, since it is larger than the sum of its proper divisors (19904733).

205330215931 is a wasteful number, since it uses less digits than its factorization.

205330215931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19904732.

The product of its (nonzero) digits is 24300, while the sum is 34.

The spelling of 205330215931 in words is "two hundred five billion, three hundred thirty million, two hundred fifteen thousand, nine hundred thirty-one".