635857420481 has 2 divisors, whose sum is σ = 635857420482. Its totient is φ = 635857420480.

The previous prime is 635857420439. The next prime is 635857420529. The reversal of 635857420481 is 184024758536.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 514352889856 + 121504530625 = 717184^2 + 348575^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-635857420481 is a prime.

It is a super-2 number, since 2×635857420481² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (635857420181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 317928710240 + 317928710241.

It is an arithmetic number, because the mean of its divisors is an integer number (317928710241).

Almost surely, 2^635857420481 is an apocalyptic number.

It is an amenable number.

635857420481 is a deficient number, since it is larger than the sum of its proper divisors (1).

635857420481 is an equidigital number, since it uses as much as digits as its factorization.

635857420481 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6451200, while the sum is 53.

The spelling of 635857420481 in words is "six hundred thirty-five billion, eight hundred fifty-seven million, four hundred twenty thousand, four hundred eighty-one".