205998934990 has 64 divisors (see below), whose sum is σ = 397193875200. Its totient is φ = 76692946176.

The previous prime is 205998934969. The next prime is 205998934991. The reversal of 205998934990 is 99439899502.

It is a super-2 number, since 2×205998934990² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (67).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205998934991) 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, 4803322 + ... + 4846018.

It is an arithmetic number, because the mean of its divisors is an integer number (6206154300).

Almost surely, 2^205998934990 is an apocalyptic number.

205998934990 is a deficient number, since it is larger than the sum of its proper divisors (191194940210).

205998934990 is a wasteful number, since it uses less digits than its factorization.

205998934990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43169.

The product of its (nonzero) digits is 56687040, while the sum is 67.

The spelling of 205998934990 in words is "two hundred five billion, nine hundred ninety-eight million, nine hundred thirty-four thousand, nine hundred ninety".