206664645331346 has 4 divisors (see below), whose sum is σ = 309996967997022. Its totient is φ = 103332322665672.

The previous prime is 206664645331321. The next prime is 206664645331349. The reversal of 206664645331346 is 643133546466602.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 206255870515321 + 408774816025 = 14361611^2 + 639355^2 .

It is not an unprimeable number, because it can be changed into a prime (206664645331349) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51666161332835 + ... + 51666161332838.

Almost surely, 2^{206664645331346} is an apocalyptic number.

206664645331346 is a deficient number, since it is larger than the sum of its proper divisors (103332322665676).

206664645331346 is a wasteful number, since it uses less digits than its factorization.

206664645331346 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103332322665675.

The product of its (nonzero) digits is 134369280, while the sum is 59.

The spelling of 206664645331346 in words is "two hundred six trillion, six hundred sixty-four billion, six hundred forty-five million, three hundred thirty-one thousand, three hundred forty-six".