56586067981 has 2 divisors, whose sum is σ = 56586067982. Its totient is φ = 56586067980.

The previous prime is 56586067969. The next prime is 56586068017. The reversal of 56586067981 is 18976068565.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30718170756 + 25867897225 = 175266^2 + 160835^2 .

It is a cyclic number.

It is not a de Polignac number, because 56586067981 - 2⁵ = 56586067949 is a prime.

It is a super-2 number, since 2×56586067981² (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 (56586067921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28293033990 + 28293033991.

It is an arithmetic number, because the mean of its divisors is an integer number (28293033991).

Almost surely, 2^56586067981 is an apocalyptic number.

It is an amenable number.

56586067981 is a deficient number, since it is larger than the sum of its proper divisors (1).

56586067981 is an equidigital number, since it uses as much as digits as its factorization.

56586067981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21772800, while the sum is 61.

The spelling of 56586067981 in words is "fifty-six billion, five hundred eighty-six million, sixty-seven thousand, nine hundred eighty-one".