72138414847 has 4 divisors (see below), whose sum is σ = 72141847920. Its totient is φ = 72134981776.

The previous prime is 72138414841. The next prime is 72138414869. The reversal of 72138414847 is 74841483127.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 74841483127 = 89317 ⋅837931.

It is a cyclic number.

It is not a de Polignac number, because 72138414847 - 2²³ = 72130026239 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 72138414847.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72138414841) 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, 1684822 + ... + 1727107.

It is an arithmetic number, because the mean of its divisors is an integer number (18035461980).

Almost surely, 2^72138414847 is an apocalyptic number.

72138414847 is a deficient number, since it is larger than the sum of its proper divisors (3433073).

72138414847 is a wasteful number, since it uses less digits than its factorization.

72138414847 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3433072.

The product of its digits is 1204224, while the sum is 49.

The spelling of 72138414847 in words is "seventy-two billion, one hundred thirty-eight million, four hundred fourteen thousand, eight hundred forty-seven".