667576369 has 2 divisors, whose sum is σ = 667576370. Its totient is φ = 667576368.

The previous prime is 667576363. The next prime is 667576373. The reversal of 667576369 is 963675766.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 561073969 + 106502400 = 23687^2 + 10320^2 .

It is a cyclic number.

It is not a de Polignac number, because 667576369 - 2⁷ = 667576241 is a prime.

It is a super-4 number, since 4×667576369⁴ (a number of 36 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is not a weakly prime, because it can be changed into another prime (667576363) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333788184 + 333788185.

It is an arithmetic number, because the mean of its divisors is an integer number (333788185).

Almost surely, 2^667576369 is an apocalyptic number.

It is an amenable number.

667576369 is a deficient number, since it is larger than the sum of its proper divisors (1).

667576369 is an equidigital number, since it uses as much as digits as its factorization.

667576369 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8573040, while the sum is 55.

The square root of 667576369 is about 25837.4992791485. The cubic root of 667576369 is about 873.9776332321.

The spelling of 667576369 in words is "six hundred sixty-seven million, five hundred seventy-six thousand, three hundred sixty-nine".