56575516381 has 2 divisors, whose sum is σ = 56575516382. Its totient is φ = 56575516380.

The previous prime is 56575516379. The next prime is 56575516391. The reversal of 56575516381 is 18361557565.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 48825531225 + 7749985156 = 220965^2 + 88034^2 .

It is a cyclic number.

It is not a de Polignac number, because 56575516381 - 2¹ = 56575516379 is a prime.

It is a super-2 number, since 2×56575516381² (a number of 22 digits) contains 22 as substring.

Together with 56575516379, 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 (56575516331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28287758190 + 28287758191.

It is an arithmetic number, because the mean of its divisors is an integer number (28287758191).

Almost surely, 2^56575516381 is an apocalyptic number.

It is an amenable number.

56575516381 is a deficient number, since it is larger than the sum of its proper divisors (1).

56575516381 is an equidigital number, since it uses as much as digits as its factorization.

56575516381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3780000, while the sum is 52.

The spelling of 56575516381 in words is "fifty-six billion, five hundred seventy-five million, five hundred sixteen thousand, three hundred eighty-one".