52445665381 has 2 divisors, whose sum is σ = 52445665382. Its totient is φ = 52445665380.

The previous prime is 52445665361. The next prime is 52445665451. The reversal of 52445665381 is 18356654425.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26295541281 + 26150124100 = 162159^2 + 161710^2 .

It is a cyclic number.

It is not a de Polignac number, because 52445665381 - 2⁷ = 52445665253 is a prime.

It is a super-2 number, since 2×52445665381² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (52445665301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26222832690 + 26222832691.

It is an arithmetic number, because the mean of its divisors is an integer number (26222832691).

Almost surely, 2^52445665381 is an apocalyptic number.

It is an amenable number.

52445665381 is a deficient number, since it is larger than the sum of its proper divisors (1).

52445665381 is an equidigital number, since it uses as much as digits as its factorization.

52445665381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3456000, while the sum is 49.

The spelling of 52445665381 in words is "fifty-two billion, four hundred forty-five million, six hundred sixty-five thousand, three hundred eighty-one".