72147757229 has 2 divisors, whose sum is σ = 72147757230. Its totient is φ = 72147757228.

The previous prime is 72147757181. The next prime is 72147757273. The reversal of 72147757229 is 92275774127.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 65793276004 + 6354481225 = 256502^2 + 79715^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72147757229 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72147757729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36073878614 + 36073878615.

It is an arithmetic number, because the mean of its divisors is an integer number (36073878615).

Almost surely, 2^72147757229 is an apocalyptic number.

It is an amenable number.

72147757229 is a deficient number, since it is larger than the sum of its proper divisors (1).

72147757229 is an equidigital number, since it uses as much as digits as its factorization.

72147757229 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3457440, while the sum is 53.

The spelling of 72147757229 in words is "seventy-two billion, one hundred forty-seven million, seven hundred fifty-seven thousand, two hundred twenty-nine".