67909943617 has 2 divisors, whose sum is σ = 67909943618. Its totient is φ = 67909943616.

The previous prime is 67909943533. The next prime is 67909943657. The reversal of 67909943617 is 71634990976.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 40593787441 + 27316156176 = 201479^2 + 165276^2 .

It is a cyclic number.

It is not a de Polignac number, because 67909943617 - 2³¹ = 65762459969 is a prime.

It is a super-2 number, since 2×67909943617² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (67909943657) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33954971808 + 33954971809.

It is an arithmetic number, because the mean of its divisors is an integer number (33954971809).

Almost surely, 2^67909943617 is an apocalyptic number.

It is an amenable number.

67909943617 is a deficient number, since it is larger than the sum of its proper divisors (1).

67909943617 is an equidigital number, since it uses as much as digits as its factorization.

67909943617 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15431472, while the sum is 61.

The spelling of 67909943617 in words is "sixty-seven billion, nine hundred nine million, nine hundred forty-three thousand, six hundred seventeen".