164111557 has 4 divisors (see below), whose sum is σ = 173765196. Its totient is φ = 154457920.

The previous prime is 164111537. The next prime is 164111573. The reversal of 164111557 is 755111461.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 58967041 + 105144516 = 7679^2 + 10254^2 .

It is a de Polignac number, because none of the positive numbers 2^k-164111557 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (164111537) 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, 4826794 + ... + 4826827.

It is an arithmetic number, because the mean of its divisors is an integer number (43441299).

Almost surely, 2^164111557 is an apocalyptic number.

164111557 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

164111557 is a deficient number, since it is larger than the sum of its proper divisors (9653639).

164111557 is an equidigital number, since it uses as much as digits as its factorization.

164111557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9653638.

The product of its digits is 4200, while the sum is 31.

The square root of 164111557 is about 12810.6033035139. The cubic root of 164111557 is about 547.4944511298.

The spelling of 164111557 in words is "one hundred sixty-four million, one hundred eleven thousand, five hundred fifty-seven".