165651563352366 has 96 divisors (see below), whose sum is σ = 441993886763520. Its totient is φ = 43662967693632.

The previous prime is 165651563352277. The next prime is 165651563352391. The reversal of 165651563352366 is 663253365156561.

It is a happy number.

165651563352366 is a `hidden beast` number, since 1 + 6 + 5 + 6 + 5 + 1 + 563 + 3 + 5 + 2 + 3 + 66 = 666.

165651563352366 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 26524906 + ... + 32169453.

It is an arithmetic number, because the mean of its divisors is an integer number (4604102987120).

Almost surely, 2^{165651563352366} is an apocalyptic number.

165651563352366 is an abundant number, since it is smaller than the sum of its proper divisors (276342323411154).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

165651563352366 is a wasteful number, since it uses less digits than its factorization.

165651563352366 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58696110 (or 58696107 counting only the distinct ones).

The product of its digits is 262440000, while the sum is 63.

The spelling of 165651563352366 in words is "one hundred sixty-five trillion, six hundred fifty-one billion, five hundred sixty-three million, three hundred fifty-two thousand, three hundred sixty-six".