661862206 has 8 divisors (see below), whose sum is σ = 1003948560. Its totient is φ = 327212688.

The previous prime is 661862167. The next prime is 661862209. The reversal of 661862206 is 602268166.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661862209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1858986 + ... + 1859341.

It is an arithmetic number, because the mean of its divisors is an integer number (125493570).

Almost surely, 2^661862206 is an apocalyptic number.

661862206 is a deficient number, since it is larger than the sum of its proper divisors (342086354).

661862206 is a wasteful number, since it uses less digits than its factorization.

661862206 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3718418.

The product of its (nonzero) digits is 41472, while the sum is 37.

The square root of 661862206 is about 25726.6827632324. The cubic root of 661862206 is about 871.4768617843.

The spelling of 661862206 in words is "six hundred sixty-one million, eight hundred sixty-two thousand, two hundred six".