55396763581 has 2 divisors, whose sum is σ = 55396763582. Its totient is φ = 55396763580.

The previous prime is 55396763579. The next prime is 55396763627. The reversal of 55396763581 is 18536769355.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 49912028100 + 5484735481 = 223410^2 + 74059^2 .

It is a cyclic number.

It is not a de Polignac number, because 55396763581 - 2¹ = 55396763579 is a prime.

It is a super-2 number, since 2×55396763581² (a number of 22 digits) contains 22 as substring.

Together with 55396763579, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55396763531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27698381790 + 27698381791.

It is an arithmetic number, because the mean of its divisors is an integer number (27698381791).

Almost surely, 2^55396763581 is an apocalyptic number.

It is an amenable number.

55396763581 is a deficient number, since it is larger than the sum of its proper divisors (1).

55396763581 is an equidigital number, since it uses as much as digits as its factorization.

55396763581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20412000, while the sum is 58.

The spelling of 55396763581 in words is "fifty-five billion, three hundred ninety-six million, seven hundred sixty-three thousand, five hundred eighty-one".