667428168553 has 2 divisors, whose sum is σ = 667428168554. Its totient is φ = 667428168552.

The previous prime is 667428168349. The next prime is 667428168577. The reversal of 667428168553 is 355861824766.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 334514170384 + 332913998169 = 578372^2 + 576987^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-667428168553 is a prime.

It is a super-2 number, since 2×667428168553² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 667428168491 and 667428168500.

It is not a weakly prime, because it can be changed into another prime (667428166553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333714084276 + 333714084277.

It is an arithmetic number, because the mean of its divisors is an integer number (333714084277).

Almost surely, 2^667428168553 is an apocalyptic number.

It is an amenable number.

667428168553 is a deficient number, since it is larger than the sum of its proper divisors (1).

667428168553 is an equidigital number, since it uses as much as digits as its factorization.

667428168553 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 58060800, while the sum is 61.

The spelling of 667428168553 in words is "six hundred sixty-seven billion, four hundred twenty-eight million, one hundred sixty-eight thousand, five hundred fifty-three".