661566202 has 8 divisors (see below), whose sum is σ = 1082562912. Its totient is φ = 300711900.

The previous prime is 661566173. The next prime is 661566209. The reversal of 661566202 is 202665166.

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

It is a super-3 number, since 3×661566202³ (a number of 27 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (661566209) 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, 15035574 + ... + 15035617.

It is an arithmetic number, because the mean of its divisors is an integer number (135320364).

Almost surely, 2^661566202 is an apocalyptic number.

661566202 is a deficient number, since it is larger than the sum of its proper divisors (420996710).

661566202 is a wasteful number, since it uses less digits than its factorization.

661566202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30071204.

The product of its (nonzero) digits is 25920, while the sum is 34.

The square root of 661566202 is about 25720.9292600404. The cubic root of 661566202 is about 871.3469258248.

The spelling of 661566202 in words is "six hundred sixty-one million, five hundred sixty-six thousand, two hundred two".