165551161556 has 24 divisors (see below), whose sum is σ = 316353021600. Its totient is φ = 75178908000.

The previous prime is 165551161493. The next prime is 165551161561. The reversal of 165551161556 is 655161155561.

165551161556 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×165551161556² (a number of 23 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 165551161556.

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 7 ways as a sum of consecutive naturals, for example, 1743731 + ... + 1836218.

It is an arithmetic number, because the mean of its divisors is an integer number (13181375900).

Almost surely, 2^165551161556 is an apocalyptic number.

It is an amenable number.

165551161556 is a deficient number, since it is larger than the sum of its proper divisors (150801860044).

165551161556 is a wasteful number, since it uses less digits than its factorization.

165551161556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3581015 (or 3581013 counting only the distinct ones).

The product of its digits is 675000, while the sum is 47.

The spelling of 165551161556 in words is "one hundred sixty-five billion, five hundred fifty-one million, one hundred sixty-one thousand, five hundred fifty-six".