205213165690 has 64 divisors (see below), whose sum is σ = 406642078080. Its totient is φ = 74102688000.

The previous prime is 205213165687. The next prime is 205213165697. The reversal of 205213165690 is 96561312502.

It is a super-2 number, since 2×205213165690² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (205213165697) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1125940 + ... + 1295440.

It is an arithmetic number, because the mean of its divisors is an integer number (6353782470).

Almost surely, 2^205213165690 is an apocalyptic number.

205213165690 is a deficient number, since it is larger than the sum of its proper divisors (201428912390).

205213165690 is a wasteful number, since it uses less digits than its factorization.

205213165690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 169727.

The product of its (nonzero) digits is 97200, while the sum is 40.

The spelling of 205213165690 in words is "two hundred five billion, two hundred thirteen million, one hundred sixty-five thousand, six hundred ninety".