661606179 has 16 divisors (see below), whose sum is σ = 954832032. Its totient is φ = 405070848.

The previous prime is 661606177. The next prime is 661606189. The reversal of 661606179 is 971606166.

It is not a de Polignac number, because 661606179 - 2¹ = 661606177 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 661606179.

It is not an unprimeable number, because it can be changed into a prime (661606177) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 35374 + ... + 50739.

It is an arithmetic number, because the mean of its divisors is an integer number (59677002).

Almost surely, 2^661606179 is an apocalyptic number.

661606179 is a deficient number, since it is larger than the sum of its proper divisors (293225853).

661606179 is a wasteful number, since it uses less digits than its factorization.

661606179 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86326.

The product of its (nonzero) digits is 81648, while the sum is 42.

The square root of 661606179 is about 25721.7063780769. The cubic root of 661606179 is about 871.3644766682.

The spelling of 661606179 in words is "six hundred sixty-one million, six hundred six thousand, one hundred seventy-nine".