206661654 has 12 divisors (see below), whose sum is σ = 447766956. Its totient is φ = 68887212.

The previous prime is 206661583. The next prime is 206661661. The reversal of 206661654 is 456166602.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5740584 + ... + 5740619.

It is an arithmetic number, because the mean of its divisors is an integer number (37313913).

Almost surely, 2^206661654 is an apocalyptic number.

206661654 is an abundant number, since it is smaller than the sum of its proper divisors (241105302).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

206661654 is a wasteful number, since it uses less digits than its factorization.

206661654 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11481211 (or 11481208 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 36.

The square root of 206661654 is about 14375.7314248702. The cubic root of 206661654 is about 591.2256947608.

The spelling of 206661654 in words is "two hundred six million, six hundred sixty-one thousand, six hundred fifty-four".