67317077716645 has 4 divisors (see below), whose sum is σ = 80780493259980. Its totient is φ = 53853662173312.

The previous prime is 67317077716591. The next prime is 67317077716699. The reversal of 67317077716645 is 54661777071376.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (67317077716591) and next prime (67317077716699).

It can be written as a sum of positive squares in 2 ways, for example, as 29796466800996 + 37520610915649 = 5458614^2 + 6125407^2 .

It is a cyclic number.

It is not a de Polignac number, because 67317077716645 - 2²⁹ = 67316540845733 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6731707771660 + ... + 6731707771669.

It is an arithmetic number, because the mean of its divisors is an integer number (20195123314995).

Almost surely, 2^{67317077716645} is an apocalyptic number.

It is an amenable number.

67317077716645 is a deficient number, since it is larger than the sum of its proper divisors (13463415543335).

67317077716645 is a wasteful number, since it uses less digits than its factorization.

67317077716645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13463415543334.

The product of its (nonzero) digits is 217818720, while the sum is 67.

The spelling of 67317077716645 in words is "sixty-seven trillion, three hundred seventeen billion, seventy-seven million, seven hundred sixteen thousand, six hundred forty-five".