661616606 has 8 divisors (see below), whose sum is σ = 1134199920. Its totient is φ = 283549968.

The previous prime is 661616587. The next prime is 661616611. The reversal of 661616606 is 606616166.

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

It is a self number, because there is not a number n which added to its sum of digits gives 661616606.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23629151 + ... + 23629178.

It is an arithmetic number, because the mean of its divisors is an integer number (141774990).

Almost surely, 2^661616606 is an apocalyptic number.

661616606 is a deficient number, since it is larger than the sum of its proper divisors (472583314).

661616606 is a wasteful number, since it uses less digits than its factorization.

661616606 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47258338.

The product of its (nonzero) digits is 46656, while the sum is 38.

The square root of 661616606 is about 25721.9090660083. The cubic root of 661616606 is about 871.3690542503.

The spelling of 661616606 in words is "six hundred sixty-one million, six hundred sixteen thousand, six hundred six".