667750129 has 2 divisors, whose sum is σ = 667750130. Its totient is φ = 667750128.

The previous prime is 667750049. The next prime is 667750151. The reversal of 667750129 is 921057766.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 545315904 + 122434225 = 23352^2 + 11065^2 .

It is a cyclic number.

It is not a de Polignac number, because 667750129 - 2¹³ = 667741937 is a prime.

It is not a weakly prime, because it can be changed into another prime (667750229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333875064 + 333875065.

It is an arithmetic number, because the mean of its divisors is an integer number (333875065).

Almost surely, 2^667750129 is an apocalyptic number.

It is an amenable number.

667750129 is a deficient number, since it is larger than the sum of its proper divisors (1).

667750129 is an equidigital number, since it uses as much as digits as its factorization.

667750129 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 158760, while the sum is 43.

The square root of 667750129 is about 25840.8616148920. The cubic root of 667750129 is about 874.0534543599.

The spelling of 667750129 in words is "six hundred sixty-seven million, seven hundred fifty thousand, one hundred twenty-nine".