205478966 has 32 divisors (see below), whose sum is σ = 406881792. Its totient is φ = 75346560.

The previous prime is 205478957. The next prime is 205478969. The reversal of 205478966 is 669874502.

It is a self number, because there is not a number n which added to its sum of digits gives 205478966.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205478969) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36626 + ... + 41861.

It is an arithmetic number, because the mean of its divisors is an integer number (12715056).

Almost surely, 2^205478966 is an apocalyptic number.

205478966 is a deficient number, since it is larger than the sum of its proper divisors (201402826).

205478966 is a wasteful number, since it uses less digits than its factorization.

205478966 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78524.

The product of its (nonzero) digits is 725760, while the sum is 47.

The square root of 205478966 is about 14334.5375230595. The cubic root of 205478966 is about 590.0957098394.

The spelling of 205478966 in words is "two hundred five million, four hundred seventy-eight thousand, nine hundred sixty-six".