165621056 has 14 divisors (see below), whose sum is σ = 328654410. Its totient is φ = 82810496.

The previous prime is 165621041. The next prime is 165621103. The reversal of 165621056 is 650126561.

165621056 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 163430656 + 2190400 = 12784^2 + 1480^2 .

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1293851 + ... + 1293978.

It is an arithmetic number, because the mean of its divisors is an integer number (23475315).

Almost surely, 2^165621056 is an apocalyptic number.

165621056 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

165621056 is a deficient number, since it is larger than the sum of its proper divisors (163033354).

165621056 is an equidigital number, since it uses as much as digits as its factorization.

165621056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2587841 (or 2587831 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 32.

The square root of 165621056 is about 12869.3844452639. The cubic root of 165621056 is about 549.1679496067.

The spelling of 165621056 in words is "one hundred sixty-five million, six hundred twenty-one thousand, fifty-six".