667554361 has 2 divisors, whose sum is σ = 667554362. Its totient is φ = 667554360.

The previous prime is 667554353. The next prime is 667554389. The reversal of 667554361 is 163455766.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 335622400 + 331931961 = 18320^2 + 18219^2 .

It is a cyclic number.

It is not a de Polignac number, because 667554361 - 2³ = 667554353 is a prime.

It is not a weakly prime, because it can be changed into another prime (667554331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333777180 + 333777181.

It is an arithmetic number, because the mean of its divisors is an integer number (333777181).

Almost surely, 2^667554361 is an apocalyptic number.

It is an amenable number.

667554361 is a deficient number, since it is larger than the sum of its proper divisors (1).

667554361 is an equidigital number, since it uses as much as digits as its factorization.

667554361 is an evil number, because the sum of its binary digits is even.

The product of its digits is 453600, while the sum is 43.

The square root of 667554361 is about 25837.0733830285. The cubic root of 667554361 is about 873.9680289820.

The spelling of 667554361 in words is "six hundred sixty-seven million, five hundred fifty-four thousand, three hundred sixty-one".