661434178 has 8 divisors (see below), whose sum is σ = 995342400. Its totient is φ = 329653380.

The previous prime is 661434143. The next prime is 661434199. The reversal of 661434178 is 871434166.

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 661434178.

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, 531078 + ... + 532321.

It is an arithmetic number, because the mean of its divisors is an integer number (124417800).

Almost surely, 2^661434178 is an apocalyptic number.

661434178 is a deficient number, since it is larger than the sum of its proper divisors (333908222).

661434178 is a wasteful number, since it uses less digits than its factorization.

661434178 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1063712.

The product of its digits is 96768, while the sum is 40.

The square root of 661434178 is about 25718.3626617248. The cubic root of 661434178 is about 871.2889591595.

The spelling of 661434178 in words is "six hundred sixty-one million, four hundred thirty-four thousand, one hundred seventy-eight".