67144705616 has 20 divisors (see below), whose sum is σ = 130241232852. Its totient is φ = 33534064896.

The previous prime is 67144705613. The next prime is 67144705699. The reversal of 67144705616 is 61650744176.

It can be written as a sum of positive squares in 2 ways, for example, as 50893555216 + 16251150400 = 225596^2 + 127480^2 .

It is a super-2 number, since 2×67144705616² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67144705613) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2378525 + ... + 2406588.

Almost surely, 2^67144705616 is an apocalyptic number.

It is an amenable number.

67144705616 is a deficient number, since it is larger than the sum of its proper divisors (63096527236).

67144705616 is a wasteful number, since it uses less digits than its factorization.

67144705616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4785998 (or 4785992 counting only the distinct ones).

The product of its (nonzero) digits is 846720, while the sum is 47.

The spelling of 67144705616 in words is "sixty-seven billion, one hundred forty-four million, seven hundred five thousand, six hundred sixteen".