667554697 has 2 divisors, whose sum is σ = 667554698. Its totient is φ = 667554696.

The previous prime is 667554689. The next prime is 667554739. The reversal of 667554697 is 796455766.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 509901561 + 157653136 = 22581^2 + 12556^2 .

It is a cyclic number.

It is not a de Polignac number, because 667554697 - 2³ = 667554689 is a prime.

It is not a weakly prime, because it can be changed into another prime (667554617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333777348 + 333777349.

It is an arithmetic number, because the mean of its divisors is an integer number (333777349).

Almost surely, 2^667554697 is an apocalyptic number.

It is an amenable number.

667554697 is a deficient number, since it is larger than the sum of its proper divisors (1).

667554697 is an equidigital number, since it uses as much as digits as its factorization.

667554697 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9525600, while the sum is 55.

The square root of 667554697 is about 25837.0798853121. The cubic root of 667554697 is about 873.9681756134.

The spelling of 667554697 in words is "six hundred sixty-seven million, five hundred fifty-four thousand, six hundred ninety-seven".