538857758821 has 2 divisors, whose sum is σ = 538857758822. Its totient is φ = 538857758820.

The previous prime is 538857758801. The next prime is 538857758861. The reversal of 538857758821 is 128857758835.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 492109265025 + 46748493796 = 701505^2 + 216214^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-538857758821 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (538857758801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 269428879410 + 269428879411.

It is an arithmetic number, because the mean of its divisors is an integer number (269428879411).

Almost surely, 2^538857758821 is an apocalyptic number.

It is an amenable number.

538857758821 is a deficient number, since it is larger than the sum of its proper divisors (1).

538857758821 is an equidigital number, since it uses as much as digits as its factorization.

538857758821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 150528000, while the sum is 67.

The spelling of 538857758821 in words is "five hundred thirty-eight billion, eight hundred fifty-seven million, seven hundred fifty-eight thousand, eight hundred twenty-one".