164675881 has 2 divisors, whose sum is σ = 164675882. Its totient is φ = 164675880.

The previous prime is 164675867. The next prime is 164675893. The reversal of 164675881 is 188576461.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 111619225 + 53056656 = 10565^2 + 7284^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-164675881 is a prime.

It is a super-2 number, since 2×164675881² = 54236291566252322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (164675801) 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 as a sum of consecutive naturals, namely, 82337940 + 82337941.

It is an arithmetic number, because the mean of its divisors is an integer number (82337941).

Almost surely, 2^164675881 is an apocalyptic number.

It is an amenable number.

164675881 is a deficient number, since it is larger than the sum of its proper divisors (1).

164675881 is an equidigital number, since it uses as much as digits as its factorization.

164675881 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 322560, while the sum is 46.

The square root of 164675881 is about 12832.6100618697. The cubic root of 164675881 is about 548.1212824515.

The spelling of 164675881 in words is "one hundred sixty-four million, six hundred seventy-five thousand, eight hundred eighty-one".