205355686828 has 24 divisors (see below), whose sum is σ = 380633701392. Its totient is φ = 96607064064.

The previous prime is 205355686787. The next prime is 205355686859. The reversal of 205355686828 is 828686553502.

It is a happy number.

It is a super-2 number, since 2×205355686828² (a number of 23 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (58) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 268026 + ... + 694657.

It is an arithmetic number, because the mean of its divisors is an integer number (15859737558).

Almost surely, 2^205355686828 is an apocalyptic number.

It is an amenable number.

205355686828 is a deficient number, since it is larger than the sum of its proper divisors (175278014564).

205355686828 is a wasteful number, since it uses less digits than its factorization.

205355686828 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 965841 (or 965839 counting only the distinct ones).

The product of its (nonzero) digits is 27648000, while the sum is 58.

The spelling of 205355686828 in words is "two hundred five billion, three hundred fifty-five million, six hundred eighty-six thousand, eight hundred twenty-eight".