164661857 has 2 divisors, whose sum is σ = 164661858. Its totient is φ = 164661856.

The previous prime is 164661839. The next prime is 164661901. The reversal of 164661857 is 758166461.

It is an a-pointer prime, because the next prime (164661901) can be obtained adding 164661857 to its sum of digits (44).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 149793121 + 14868736 = 12239^2 + 3856^2 .

It is a cyclic number.

It is not a de Polignac number, because 164661857 - 2¹² = 164657761 is a prime.

It is a super-2 number, since 2×164661857² = 54227054301376898, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (164661457) 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, 82330928 + 82330929.

It is an arithmetic number, because the mean of its divisors is an integer number (82330929).

Almost surely, 2^164661857 is an apocalyptic number.

It is an amenable number.

164661857 is a deficient number, since it is larger than the sum of its proper divisors (1).

164661857 is an equidigital number, since it uses as much as digits as its factorization.

164661857 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 241920, while the sum is 44.

The square root of 164661857 is about 12832.0636298298. The cubic root of 164661857 is about 548.1057224495.

The spelling of 164661857 in words is "one hundred sixty-four million, six hundred sixty-one thousand, eight hundred fifty-seven".