161728780126 has 8 divisors (see below), whose sum is σ = 242627714280. Its totient is φ = 80852875368.

The previous prime is 161728780069. The next prime is 161728780141. The reversal of 161728780126 is 621087827161.

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 161728780126.

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, 5739781 + ... + 5767888.

It is an arithmetic number, because the mean of its divisors is an integer number (30328464285).

Almost surely, 2^161728780126 is an apocalyptic number.

161728780126 is a deficient number, since it is larger than the sum of its proper divisors (80898934154).

161728780126 is a wasteful number, since it uses less digits than its factorization.

161728780126 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11514698.

The product of its (nonzero) digits is 451584, while the sum is 49.

The spelling of 161728780126 in words is "one hundred sixty-one billion, seven hundred twenty-eight million, seven hundred eighty thousand, one hundred twenty-six".