72120510913 has 4 divisors (see below), whose sum is σ = 78676921008. Its totient is φ = 65564100820.

The previous prime is 72120510911. The next prime is 72120510991. The reversal of 72120510913 is 31901502127.

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 72120510913 - 2¹ = 72120510911 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72120510911) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3278205031 + ... + 3278205052.

It is an arithmetic number, because the mean of its divisors is an integer number (19669230252).

Almost surely, 2^72120510913 is an apocalyptic number.

It is an amenable number.

72120510913 is a deficient number, since it is larger than the sum of its proper divisors (6556410095).

72120510913 is a wasteful number, since it uses less digits than its factorization.

72120510913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6556410094.

The product of its (nonzero) digits is 3780, while the sum is 31.

The spelling of 72120510913 in words is "seventy-two billion, one hundred twenty million, five hundred ten thousand, nine hundred thirteen".