56472720581 has 2 divisors, whose sum is σ = 56472720582. Its totient is φ = 56472720580.

The previous prime is 56472720497. The next prime is 56472720583. The reversal of 56472720581 is 18502727465.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 33479850625 + 22992869956 = 182975^2 + 151634^2 .

It is a cyclic number.

It is not a de Polignac number, because 56472720581 - 2¹⁰ = 56472719557 is a prime.

It is a super-2 number, since 2×56472720581² (a number of 22 digits) contains 22 as substring.

Together with 56472720583, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56472720583) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28236360290 + 28236360291.

It is an arithmetic number, because the mean of its divisors is an integer number (28236360291).

Almost surely, 2^56472720581 is an apocalyptic number.

It is an amenable number.

56472720581 is a deficient number, since it is larger than the sum of its proper divisors (1).

56472720581 is an equidigital number, since it uses as much as digits as its factorization.

56472720581 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 940800, while the sum is 47.

The spelling of 56472720581 in words is "fifty-six billion, four hundred seventy-two million, seven hundred twenty thousand, five hundred eighty-one".