72223007257 has 4 divisors (see below), whose sum is σ = 72234812596. Its totient is φ = 72211201920.

The previous prime is 72223007249. The next prime is 72223007261. The reversal of 72223007257 is 75270032227.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 75270032227 = 13 ⋅5790002479.

It can be written as a sum of positive squares in 2 ways, for example, as 38109286656 + 34113720601 = 195216^2 + 184699^2 .

It is a cyclic number.

It is not a de Polignac number, because 72223007257 - 2³ = 72223007249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72223007267) 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, 5893488 + ... + 5905729.

It is an arithmetic number, because the mean of its divisors is an integer number (18058703149).

Almost surely, 2^72223007257 is an apocalyptic number.

It is an amenable number.

72223007257 is a deficient number, since it is larger than the sum of its proper divisors (11805339).

72223007257 is a wasteful number, since it uses less digits than its factorization.

72223007257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11805338.

The product of its (nonzero) digits is 82320, while the sum is 37.

The spelling of 72223007257 in words is "seventy-two billion, two hundred twenty-three million, seven thousand, two hundred fifty-seven".