164877665 has 4 divisors (see below), whose sum is σ = 197853204. Its totient is φ = 131902128.

The previous prime is 164877653. The next prime is 164877677. The reversal of 164877665 is 566778461.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 566778461 = 167 ⋅3393883.

It is an interprime number because it is at equal distance from previous prime (164877653) and next prime (164877677).

It can be written as a sum of positive squares in 2 ways, for example, as 69072721 + 95804944 = 8311^2 + 9788^2 .

It is a cyclic number.

It is not a de Polignac number, because 164877665 - 2¹⁶ = 164812129 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16487762 + ... + 16487771.

It is an arithmetic number, because the mean of its divisors is an integer number (49463301).

Almost surely, 2^164877665 is an apocalyptic number.

It is an amenable number.

164877665 is a deficient number, since it is larger than the sum of its proper divisors (32975539).

164877665 is an equidigital number, since it uses as much as digits as its factorization.

164877665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32975538.

The product of its digits is 1693440, while the sum is 50.

The square root of 164877665 is about 12840.4698122771. The cubic root of 164877665 is about 548.3450694441.

The spelling of 164877665 in words is "one hundred sixty-four million, eight hundred seventy-seven thousand, six hundred sixty-five".