72177348281 has 4 divisors (see below), whose sum is σ = 72637076772. Its totient is φ = 71717619792.

The previous prime is 72177348251. The next prime is 72177348319. The reversal of 72177348281 is 18284377127.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 37986010000 + 34191338281 = 194900^2 + 184909^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72177348281 is a prime.

It is a super-2 number, since 2×72177348281² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72177348251) 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, 229864010 + ... + 229864323.

It is an arithmetic number, because the mean of its divisors is an integer number (18159269193).

Almost surely, 2^72177348281 is an apocalyptic number.

It is an amenable number.

72177348281 is a deficient number, since it is larger than the sum of its proper divisors (459728491).

72177348281 is a wasteful number, since it uses less digits than its factorization.

72177348281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 459728490.

The product of its digits is 1053696, while the sum is 50.

The spelling of 72177348281 in words is "seventy-two billion, one hundred seventy-seven million, three hundred forty-eight thousand, two hundred eighty-one".