72012172671 has 12 divisors (see below), whose sum is σ = 104118290848. Its totient is φ = 47961634464.

The previous prime is 72012172651. The next prime is 72012172679. The reversal of 72012172671 is 17627121027.

It is not a de Polignac number, because 72012172671 - 2¹¹ = 72012170623 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72012172679) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3863575 + ... + 3882168.

Almost surely, 2^72012172671 is an apocalyptic number.

72012172671 is a deficient number, since it is larger than the sum of its proper divisors (32106118177).

72012172671 is a wasteful number, since it uses less digits than its factorization.

72012172671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7746782 (or 7746779 counting only the distinct ones).

The product of its (nonzero) digits is 16464, while the sum is 36.

Adding to 72012172671 its reverse (17627121027), we get a palindrome (89639293698).

The spelling of 72012172671 in words is "seventy-two billion, twelve million, one hundred seventy-two thousand, six hundred seventy-one".