667221127 has 2 divisors, whose sum is σ = 667221128. Its totient is φ = 667221126.

The previous prime is 667221101. The next prime is 667221131. The reversal of 667221127 is 721122766.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 667221127 - 2²⁷ = 533003399 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 667221092 and 667221101.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (667221197) 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, 333610563 + 333610564.

It is an arithmetic number, because the mean of its divisors is an integer number (333610564).

Almost surely, 2^667221127 is an apocalyptic number.

667221127 is a deficient number, since it is larger than the sum of its proper divisors (1).

667221127 is an equidigital number, since it uses as much as digits as its factorization.

667221127 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14112, while the sum is 34.

The square root of 667221127 is about 25830.6238213482. The cubic root of 667221127 is about 873.8225804847.

The spelling of 667221127 in words is "six hundred sixty-seven million, two hundred twenty-one thousand, one hundred twenty-seven".