67657777168 has 40 divisors (see below), whose sum is σ = 134458468760. Its totient is φ = 32968995840.

The previous prime is 67657777163. The next prime is 67657777189. The reversal of 67657777168 is 86177775676.

It can be written as a sum of positive squares in 4 ways, for example, as 12203179024 + 55454598144 = 110468^2 + 235488^2 .

It is a super-2 number, since 2×67657777168² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (67657777163) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 211605 + ... + 424372.

It is an arithmetic number, because the mean of its divisors is an integer number (3361461719).

Almost surely, 2^67657777168 is an apocalyptic number.

It is an amenable number.

67657777168 is a deficient number, since it is larger than the sum of its proper divisors (66800691592).

67657777168 is a wasteful number, since it uses less digits than its factorization.

67657777168 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 636155 (or 636149 counting only the distinct ones).

The product of its digits is 145212480, while the sum is 67.

The spelling of 67657777168 in words is "sixty-seven billion, six hundred fifty-seven million, seven hundred seventy-seven thousand, one hundred sixty-eight".