72120835617 has 4 divisors (see below), whose sum is σ = 96161114160. Its totient is φ = 48080557076.

The previous prime is 72120835571. The next prime is 72120835679. The reversal of 72120835617 is 71653802127.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 72120835617 - 2⁷ = 72120835489 is a prime.

It is not an unprimeable number, because it can be changed into a prime (72120835697) 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, 12020139267 + ... + 12020139272.

It is an arithmetic number, because the mean of its divisors is an integer number (24040278540).

Almost surely, 2^72120835617 is an apocalyptic number.

It is an amenable number.

72120835617 is a deficient number, since it is larger than the sum of its proper divisors (24040278543).

72120835617 is a wasteful number, since it uses less digits than its factorization.

72120835617 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24040278542.

The product of its (nonzero) digits is 141120, while the sum is 42.

The spelling of 72120835617 in words is "seventy-two billion, one hundred twenty million, eight hundred thirty-five thousand, six hundred seventeen".