72327771181 has 4 divisors (see below), whose sum is σ = 76134496000. Its totient is φ = 68521046364.

The previous prime is 72327771157. The next prime is 72327771211. The reversal of 72327771181 is 18117772327.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 72327771181 - 2¹³ = 72327762989 is a prime.

It is a super-3 number, since 3×72327771181³ (a number of 34 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72327771121) 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, 1903362381 + ... + 1903362418.

It is an arithmetic number, because the mean of its divisors is an integer number (19033624000).

Almost surely, 2^72327771181 is an apocalyptic number.

It is an amenable number.

72327771181 is a deficient number, since it is larger than the sum of its proper divisors (3806724819).

72327771181 is a wasteful number, since it uses less digits than its factorization.

72327771181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3806724818.

The product of its digits is 230496, while the sum is 46.

The spelling of 72327771181 in words is "seventy-two billion, three hundred twenty-seven million, seven hundred seventy-one thousand, one hundred eighty-one".