67777789445 has 4 divisors (see below), whose sum is σ = 81333347340. Its totient is φ = 54222231552.

The previous prime is 67777789411. The next prime is 67777789543. The reversal of 67777789445 is 54498777776.

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

It can be written as a sum of positive squares in 2 ways, for example, as 33396100516 + 34381688929 = 182746^2 + 185423^2 .

It is a cyclic number.

It is not a de Polignac number, because 67777789445 - 2⁶ = 67777789381 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, 6777778940 + ... + 6777778949.

It is an arithmetic number, because the mean of its divisors is an integer number (20333336835).

Almost surely, 2^67777789445 is an apocalyptic number.

It is an amenable number.

67777789445 is a deficient number, since it is larger than the sum of its proper divisors (13555557895).

67777789445 is a wasteful number, since it uses less digits than its factorization.

67777789445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13555557894.

The product of its digits is 580849920, while the sum is 71.

The spelling of 67777789445 in words is "sixty-seven billion, seven hundred seventy-seven million, seven hundred eighty-nine thousand, four hundred forty-five".