67131345172 has 12 divisors (see below), whose sum is σ = 118088559316. Its totient is φ = 33391756800.

The previous prime is 67131345089. The next prime is 67131345179. The reversal of 67131345172 is 27154313176.

It can be written as a sum of positive squares in 2 ways, for example, as 43650073476 + 23481271696 = 208926^2 + 153236^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67131345179) 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, 43478079 + ... + 43479622.

Almost surely, 2^67131345172 is an apocalyptic number.

It is an amenable number.

67131345172 is a deficient number, since it is larger than the sum of its proper divisors (50957214144).

67131345172 is a wasteful number, since it uses less digits than its factorization.

67131345172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86957898 (or 86957896 counting only the distinct ones).

The product of its digits is 105840, while the sum is 40.

The spelling of 67131345172 in words is "sixty-seven billion, one hundred thirty-one million, three hundred forty-five thousand, one hundred seventy-two".