164278228637 has 2 divisors, whose sum is σ = 164278228638. Its totient is φ = 164278228636.

The previous prime is 164278228601. The next prime is 164278228649. The reversal of 164278228637 is 736822872461.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 162174538681 + 2103689956 = 402709^2 + 45866^2 .

It is a cyclic number.

It is not a de Polignac number, because 164278228637 - 2⁸ = 164278228381 is a prime.

It is a super-2 number, since 2×164278228637² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (164278228537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82139114318 + 82139114319.

It is an arithmetic number, because the mean of its divisors is an integer number (82139114319).

Almost surely, 2^164278228637 is an apocalyptic number.

It is an amenable number.

164278228637 is a deficient number, since it is larger than the sum of its proper divisors (1).

164278228637 is an equidigital number, since it uses as much as digits as its factorization.

164278228637 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10838016, while the sum is 56.

The spelling of 164278228637 in words is "one hundred sixty-four billion, two hundred seventy-eight million, two hundred twenty-eight thousand, six hundred thirty-seven".