538329823721 has 2 divisors, whose sum is σ = 538329823722. Its totient is φ = 538329823720.

The previous prime is 538329823693. The next prime is 538329823751. The reversal of 538329823721 is 127328923835.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 526894515625 + 11435308096 = 725875^2 + 106936^2 .

It is a cyclic number.

It is not a de Polignac number, because 538329823721 - 2²² = 538325629417 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (538329823751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 269164911860 + 269164911861.

It is an arithmetic number, because the mean of its divisors is an integer number (269164911861).

Almost surely, 2^538329823721 is an apocalyptic number.

It is an amenable number.

538329823721 is a deficient number, since it is larger than the sum of its proper divisors (1).

538329823721 is an equidigital number, since it uses as much as digits as its factorization.

538329823721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4354560, while the sum is 53.

The spelling of 538329823721 in words is "five hundred thirty-eight billion, three hundred twenty-nine million, eight hundred twenty-three thousand, seven hundred twenty-one".