67665554357 has 2 divisors, whose sum is σ = 67665554358. Its totient is φ = 67665554356.

The previous prime is 67665554321. The next prime is 67665554371. The reversal of 67665554357 is 75345556676.

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., 54947579281 + 12717975076 = 234409^2 + 112774^2 .

It is a cyclic number.

It is not a de Polignac number, because 67665554357 - 2²⁰ = 67664505781 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 67665554296 and 67665554305.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (67665554557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33832777178 + 33832777179.

It is an arithmetic number, because the mean of its divisors is an integer number (33832777179).

Almost surely, 2^67665554357 is an apocalyptic number.

It is an amenable number.

67665554357 is a deficient number, since it is larger than the sum of its proper divisors (1).

67665554357 is an equidigital number, since it uses as much as digits as its factorization.

67665554357 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 79380000, while the sum is 59.

The spelling of 67665554357 in words is "sixty-seven billion, six hundred sixty-five million, five hundred fifty-four thousand, three hundred fifty-seven".