72167422171 has 32 divisors (see below), whose sum is σ = 81343684800. Its totient is φ = 63564963840.

The previous prime is 72167422141. The next prime is 72167422181. The reversal of 72167422171 is 17122476127.

It is a cyclic number.

It is not a de Polignac number, because 72167422171 - 2⁷ = 72167422043 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72167422141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 47136676 + ... + 47138206.

It is an arithmetic number, because the mean of its divisors is an integer number (2541990150).

Almost surely, 2^72167422171 is an apocalyptic number.

72167422171 is a deficient number, since it is larger than the sum of its proper divisors (9176262629).

72167422171 is a wasteful number, since it uses less digits than its factorization.

72167422171 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2959.

The product of its digits is 65856, while the sum is 40.

Adding to 72167422171 its reverse (17122476127), we get a palindrome (89289898298).

The spelling of 72167422171 in words is "seventy-two billion, one hundred sixty-seven million, four hundred twenty-two thousand, one hundred seventy-one".