67686739409 has 2 divisors, whose sum is σ = 67686739410. Its totient is φ = 67686739408.

The previous prime is 67686739397. The next prime is 67686739427. The reversal of 67686739409 is 90493768676.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 67367759809 + 318979600 = 259553^2 + 17860^2 .

It is a cyclic number.

It is not a de Polignac number, because 67686739409 - 2¹² = 67686735313 is a prime.

It is a super-4 number, since 4×67686739409⁴ (a number of 44 digits) contains 4444 as substring.

It is not a weakly prime, because it can be changed into another prime (67686739429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33843369704 + 33843369705.

It is an arithmetic number, because the mean of its divisors is an integer number (33843369705).

Almost surely, 2^67686739409 is an apocalyptic number.

It is an amenable number.

67686739409 is a deficient number, since it is larger than the sum of its proper divisors (1).

67686739409 is an equidigital number, since it uses as much as digits as its factorization.

67686739409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 82301184, while the sum is 65.

The spelling of 67686739409 in words is "sixty-seven billion, six hundred eighty-six million, seven hundred thirty-nine thousand, four hundred nine".