661666046 has 8 divisors (see below), whose sum is σ = 1024515264. Its totient is φ = 320160960.

The previous prime is 661666043. The next prime is 661666073. The reversal of 661666046 is 640666166.

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

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 661665994 and 661666012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661666043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5335955 + ... + 5336078.

It is an arithmetic number, because the mean of its divisors is an integer number (128064408).

Almost surely, 2^661666046 is an apocalyptic number.

661666046 is a deficient number, since it is larger than the sum of its proper divisors (362849218).

661666046 is a wasteful number, since it uses less digits than its factorization.

661666046 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10672066.

The product of its (nonzero) digits is 186624, while the sum is 41.

The square root of 661666046 is about 25722.8700964725. The cubic root of 661666046 is about 871.3907583674.

The spelling of 661666046 in words is "six hundred sixty-one million, six hundred sixty-six thousand, forty-six".