165620056 has 64 divisors (see below), whose sum is σ = 373248000. Its totient is φ = 67360128.

The previous prime is 165620023. The next prime is 165620083. The reversal of 165620056 is 650026561.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 191481 + ... + 192343.

It is an arithmetic number, because the mean of its divisors is an integer number (5832000).

Almost surely, 2^165620056 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 165620056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (186624000).

165620056 is an abundant number, since it is smaller than the sum of its proper divisors (207627944).

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

165620056 is a wasteful number, since it uses less digits than its factorization.

165620056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1048 (or 1044 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 31.

The square root of 165620056 is about 12869.3455933082. The cubic root of 165620056 is about 549.1668443345.

It can be divided in two parts, 1656 and 20056, that added together give a palindrome (21712).

The spelling of 165620056 in words is "one hundred sixty-five million, six hundred twenty thousand, fifty-six".