164627641 has 4 divisors (see below), whose sum is σ = 167418000. Its totient is φ = 161837284.

The previous prime is 164627633. The next prime is 164627657. The reversal of 164627641 is 146726461.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 146726461 = 7 ⋅20960923.

It is a cyclic number.

It is not a de Polignac number, because 164627641 - 2³ = 164627633 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 164627641.

It is not an unprimeable number, because it can be changed into a prime (164627621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1395091 + ... + 1395208.

It is an arithmetic number, because the mean of its divisors is an integer number (41854500).

Almost surely, 2^164627641 is an apocalyptic number.

It is an amenable number.

164627641 is a deficient number, since it is larger than the sum of its proper divisors (2790359).

164627641 is an equidigital number, since it uses as much as digits as its factorization.

164627641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2790358.

The product of its digits is 48384, while the sum is 37.

The square root of 164627641 is about 12830.7303377477. The cubic root of 164627641 is about 548.0677551775.

The spelling of 164627641 in words is "one hundred sixty-four million, six hundred twenty-seven thousand, six hundred forty-one".