72128955099 has 4 divisors (see below), whose sum is σ = 96171940136. Its totient is φ = 48085970064.

The previous prime is 72128955071. The next prime is 72128955149. The reversal of 72128955099 is 99055982127.

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

It is not a de Polignac number, because 72128955099 - 2⁷ = 72128954971 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72128955299) 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 3 ways as a sum of consecutive naturals, for example, 12021492514 + ... + 12021492519.

It is an arithmetic number, because the mean of its divisors is an integer number (24042985034).

Almost surely, 2^72128955099 is an apocalyptic number.

72128955099 is a deficient number, since it is larger than the sum of its proper divisors (24042985037).

72128955099 is a wasteful number, since it uses less digits than its factorization.

72128955099 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24042985036.

The product of its (nonzero) digits is 4082400, while the sum is 57.

The spelling of 72128955099 in words is "seventy-two billion, one hundred twenty-eight million, nine hundred fifty-five thousand, ninety-nine".