56518999997 has 2 divisors, whose sum is σ = 56518999998. Its totient is φ = 56518999996.

The previous prime is 56518999987. The next prime is 56519000051. The reversal of 56518999997 is 79999981565.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 54596528281 + 1922471716 = 233659^2 + 43846^2 .

It is a cyclic number.

It is not a de Polignac number, because 56518999997 - 2⁸ = 56518999741 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56518999967) 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, 28259499998 + 28259499999.

It is an arithmetic number, because the mean of its divisors is an integer number (28259499999).

Almost surely, 2^56518999997 is an apocalyptic number.

It is an amenable number.

56518999997 is a deficient number, since it is larger than the sum of its proper divisors (1).

56518999997 is an equidigital number, since it uses as much as digits as its factorization.

56518999997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 496011600, while the sum is 77.

The spelling of 56518999997 in words is "fifty-six billion, five hundred eighteen million, nine hundred ninety-nine thousand, nine hundred ninety-seven".