661163078 has 8 divisors (see below), whose sum is σ = 992141040. Its totient is φ = 330449400.

The previous prime is 661163057. The next prime is 661163081. The reversal of 661163078 is 870361166.

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

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 59693 + ... + 69896.

It is an arithmetic number, because the mean of its divisors is an integer number (124017630).

Almost surely, 2^661163078 is an apocalyptic number.

661163078 is a deficient number, since it is larger than the sum of its proper divisors (330977962).

661163078 is a wasteful number, since it uses less digits than its factorization.

661163078 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132142.

The product of its (nonzero) digits is 36288, while the sum is 38.

The square root of 661163078 is about 25713.0915683043. The cubic root of 661163078 is about 871.1699053806.

The spelling of 661163078 in words is "six hundred sixty-one million, one hundred sixty-three thousand, seventy-eight".