72110100505 has 4 divisors (see below), whose sum is σ = 86532120612. Its totient is φ = 57688080400.

The previous prime is 72110100497. The next prime is 72110100521. The reversal of 72110100505 is 50500101127.

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 10098642064 + 62011458441 = 100492^2 + 249021^2 .

It is not a de Polignac number, because 72110100505 - 2³ = 72110100497 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7211010046 + ... + 7211010055.

It is an arithmetic number, because the mean of its divisors is an integer number (21633030153).

Almost surely, 2^72110100505 is an apocalyptic number.

It is an amenable number.

72110100505 is a deficient number, since it is larger than the sum of its proper divisors (14422020107).

72110100505 is a wasteful number, since it uses less digits than its factorization.

72110100505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14422020106.

The product of its (nonzero) digits is 350, while the sum is 22.

The spelling of 72110100505 in words is "seventy-two billion, one hundred ten million, one hundred thousand, five hundred five".