72505732118 has 4 divisors (see below), whose sum is σ = 108758598180. Its totient is φ = 36252866058.

The previous prime is 72505732087. The next prime is 72505732121. The reversal of 72505732118 is 81123750527.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 81123750527 = 2393 ⋅33900439.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 18126433028 + ... + 18126433031.

It is an arithmetic number, because the mean of its divisors is an integer number (27189649545).

Almost surely, 2^72505732118 is an apocalyptic number.

72505732118 is a deficient number, since it is larger than the sum of its proper divisors (36252866062).

72505732118 is a wasteful number, since it uses less digits than its factorization.

72505732118 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36252866061.

The product of its (nonzero) digits is 117600, while the sum is 41.

The spelling of 72505732118 in words is "seventy-two billion, five hundred five million, seven hundred thirty-two thousand, one hundred eighteen".