161605666565150 has 48 divisors (see below), whose sum is σ = 304123326401520. Its totient is φ = 63882429177600.

The previous prime is 161605666565087. The next prime is 161605666565209. The reversal of 161605666565150 is 51565666506161.

It is a happy number.

It is a super-2 number, since 2×161605666565150² (a number of 29 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 161605666565150.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1035581 + ... + 18007880.

It is an arithmetic number, because the mean of its divisors is an integer number (6335902633365).

Almost surely, 2^{161605666565150} is an apocalyptic number.

161605666565150 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

161605666565150 is a deficient number, since it is larger than the sum of its proper divisors (142517659836370).

161605666565150 is a wasteful number, since it uses less digits than its factorization.

161605666565150 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19045469 (or 19045464 counting only the distinct ones).

The product of its (nonzero) digits is 29160000, while the sum is 59.

The spelling of 161605666565150 in words is "one hundred sixty-one trillion, six hundred five billion, six hundred sixty-six million, five hundred sixty-five thousand, one hundred fifty".