67640045989 has 2 divisors, whose sum is σ = 67640045990. Its totient is φ = 67640045988.

The previous prime is 67640045981. The next prime is 67640046031. The reversal of 67640045989 is 98954004676.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 45426528225 + 22213517764 = 213135^2 + 149042^2 .

It is a cyclic number.

It is not a de Polignac number, because 67640045989 - 2³ = 67640045981 is a prime.

It is a super-4 number, since 4×67640045989⁴ (a number of 44 digits) contains 4444 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (67640045981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33820022994 + 33820022995.

It is an arithmetic number, because the mean of its divisors is an integer number (33820022995).

Almost surely, 2^67640045989 is an apocalyptic number.

It is an amenable number.

67640045989 is a deficient number, since it is larger than the sum of its proper divisors (1).

67640045989 is an equidigital number, since it uses as much as digits as its factorization.

67640045989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13063680, while the sum is 58.

The spelling of 67640045989 in words is "sixty-seven billion, six hundred forty million, forty-five thousand, nine hundred eighty-nine".