56155000081 has 2 divisors, whose sum is σ = 56155000082. Its totient is φ = 56155000080.

The previous prime is 56155000079. The next prime is 56155000103. The reversal of 56155000081 is 18000055165.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30053689600 + 26101310481 = 173360^2 + 161559^2 .

It is a cyclic number.

It is not a de Polignac number, because 56155000081 - 2¹ = 56155000079 is a prime.

It is a super-2 number, since 2×56155000081² (a number of 22 digits) contains 22 as substring.

Together with 56155000079, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (56155009081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28077500040 + 28077500041.

It is an arithmetic number, because the mean of its divisors is an integer number (28077500041).

Almost surely, 2^56155000081 is an apocalyptic number.

It is an amenable number.

56155000081 is a deficient number, since it is larger than the sum of its proper divisors (1).

56155000081 is an equidigital number, since it uses as much as digits as its factorization.

56155000081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6000, while the sum is 31.

The spelling of 56155000081 in words is "fifty-six billion, one hundred fifty-five million, eighty-one", and thus it is an aban number.