165115556 has 6 divisors (see below), whose sum is σ = 288952230. Its totient is φ = 82557776.

The previous prime is 165115547. The next prime is 165115583. The reversal of 165115556 is 655511561.

It can be written as a sum of positive squares in only one way, i.e., 95726656 + 69388900 = 9784^2 + 8330^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20639441 + ... + 20639448.

It is an arithmetic number, because the mean of its divisors is an integer number (48158705).

Almost surely, 2^165115556 is an apocalyptic number.

It is an amenable number.

165115556 is a deficient number, since it is larger than the sum of its proper divisors (123836674).

165115556 is a wasteful number, since it uses less digits than its factorization.

165115556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41278893 (or 41278891 counting only the distinct ones).

The product of its digits is 22500, while the sum is 35.

The square root of 165115556 is about 12849.7298026067. The cubic root of 165115556 is about 548.6086662341.

It can be divided in two parts, 16511555 and 6, that added together give a palindrome (16511561).

The spelling of 165115556 in words is "one hundred sixty-five million, one hundred fifteen thousand, five hundred fifty-six".