72164845447 has 2 divisors, whose sum is σ = 72164845448. Its totient is φ = 72164845446.

The previous prime is 72164845369. The next prime is 72164845451. The reversal of 72164845447 is 74454846127.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 72164845447 - 2¹⁵ = 72164812679 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 72164845394 and 72164845403.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72164845477) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36082422723 + 36082422724.

It is an arithmetic number, because the mean of its divisors is an integer number (36082422724).

Almost surely, 2^72164845447 is an apocalyptic number.

72164845447 is a deficient number, since it is larger than the sum of its proper divisors (1).

72164845447 is an equidigital number, since it uses as much as digits as its factorization.

72164845447 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6021120, while the sum is 52.

The spelling of 72164845447 in words is "seventy-two billion, one hundred sixty-four million, eight hundred forty-five thousand, four hundred forty-seven".