667795553 has 2 divisors, whose sum is σ = 667795554. Its totient is φ = 667795552.

The previous prime is 667795519. The next prime is 667795567. The reversal of 667795553 is 355597766.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 510217744 + 157577809 = 22588^2 + 12553^2 .

It is a cyclic number.

It is not a de Polignac number, because 667795553 - 2¹² = 667791457 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 667795495 and 667795504.

It is not a weakly prime, because it can be changed into another prime (667795153) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333897776 + 333897777.

It is an arithmetic number, because the mean of its divisors is an integer number (333897777).

Almost surely, 2^667795553 is an apocalyptic number.

It is an amenable number.

667795553 is a deficient number, since it is larger than the sum of its proper divisors (1).

667795553 is an equidigital number, since it uses as much as digits as its factorization.

667795553 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5953500, while the sum is 53.

The square root of 667795553 is about 25841.7405180069. The cubic root of 667795553 is about 874.0732732024.

The spelling of 667795553 in words is "six hundred sixty-seven million, seven hundred ninety-five thousand, five hundred fifty-three".