67720771161 has 12 divisors (see below), whose sum is σ = 97821258288. Its totient is φ = 45146088504.

The previous prime is 67720771127. The next prime is 67720771169. The reversal of 67720771161 is 16117702776.

It is not a de Polignac number, because 67720771161 - 2¹⁹ = 67720246873 is a prime.

It is a super-2 number, since 2×67720771161² (a number of 22 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (67720771169) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 511686 + ... + 630288.

It is an arithmetic number, because the mean of its divisors is an integer number (8151771524).

Almost surely, 2^67720771161 is an apocalyptic number.

It is an amenable number.

67720771161 is a deficient number, since it is larger than the sum of its proper divisors (30100487127).

67720771161 is a wasteful number, since it uses less digits than its factorization.

67720771161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 182052 (or 182049 counting only the distinct ones).

The product of its (nonzero) digits is 172872, while the sum is 45.

The spelling of 67720771161 in words is "sixty-seven billion, seven hundred twenty million, seven hundred seventy-one thousand, one hundred sixty-one".