72473168881 has 4 divisors (see below), whose sum is σ = 74972243700. Its totient is φ = 69974094064.

The previous prime is 72473168879. The next prime is 72473168917. The reversal of 72473168881 is 18886137427.

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 61707031281 + 10766137600 = 248409^2 + 103760^2 .

It is a cyclic number.

It is not a de Polignac number, because 72473168881 - 2¹ = 72473168879 is a prime.

It is a super-2 number, since 2×72473168881² (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 (72473168821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1249537366 + ... + 1249537423.

It is an arithmetic number, because the mean of its divisors is an integer number (18743060925).

Almost surely, 2^72473168881 is an apocalyptic number.

It is an amenable number.

72473168881 is a deficient number, since it is larger than the sum of its proper divisors (2499074819).

72473168881 is a wasteful number, since it uses less digits than its factorization.

72473168881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2499074818.

The product of its digits is 3612672, while the sum is 55.

The spelling of 72473168881 in words is "seventy-two billion, four hundred seventy-three million, one hundred sixty-eight thousand, eight hundred eighty-one".