205680148646 has 24 divisors (see below), whose sum is σ = 359384656176. Its totient is φ = 88027354800.

The previous prime is 205680148559. The next prime is 205680148649. The reversal of 205680148646 is 646841086502.

It is a junction number, because it is equal to n+sod(n) for n = 205680148594 and 205680148603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205680148649) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1372205 + ... + 1514696.

It is an arithmetic number, because the mean of its divisors is an integer number (14974360674).

Almost surely, 2^205680148646 is an apocalyptic number.

205680148646 is a deficient number, since it is larger than the sum of its proper divisors (153704507530).

205680148646 is a wasteful number, since it uses less digits than its factorization.

205680148646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2887644 (or 2887637 counting only the distinct ones).

The product of its (nonzero) digits is 2211840, while the sum is 50.

The spelling of 205680148646 in words is "two hundred five billion, six hundred eighty million, one hundred forty-eight thousand, six hundred forty-six".