161011505678 has 8 divisors (see below), whose sum is σ = 249308137920. Its totient is φ = 77908793040.

The previous prime is 161011505651. The next prime is 161011505713. The reversal of 161011505678 is 876505110161.

It is a happy number.

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 (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1298479823 + ... + 1298479946.

It is an arithmetic number, because the mean of its divisors is an integer number (31163517240).

Almost surely, 2^161011505678 is an apocalyptic number.

161011505678 is a deficient number, since it is larger than the sum of its proper divisors (88296632242).

161011505678 is a wasteful number, since it uses less digits than its factorization.

161011505678 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2596959802.

The product of its (nonzero) digits is 50400, while the sum is 41.

The spelling of 161011505678 in words is "one hundred sixty-one billion, eleven million, five hundred five thousand, six hundred seventy-eight".