72220720520509 has 64 divisors (see below), whose sum is σ = 91076493312000. Its totient is φ = 56374601149440.

The previous prime is 72220720520369. The next prime is 72220720520519. The reversal of 72220720520509 is 90502502702227.

It is a cyclic number.

It is not a de Polignac number, because 72220720520509 - 2¹⁹ = 72220719996221 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72220720520519) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 38548132 + ... + 40378210.

It is an arithmetic number, because the mean of its divisors is an integer number (1423070208000).

Almost surely, 2^{72220720520509} is an apocalyptic number.

It is an amenable number.

72220720520509 is a deficient number, since it is larger than the sum of its proper divisors (18855772791491).

72220720520509 is a wasteful number, since it uses less digits than its factorization.

72220720520509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1830538.

The product of its (nonzero) digits is 352800, while the sum is 43.

The spelling of 72220720520509 in words is "seventy-two trillion, two hundred twenty billion, seven hundred twenty million, five hundred twenty thousand, five hundred nine".