56891988847 has 2 divisors, whose sum is σ = 56891988848. Its totient is φ = 56891988846.

The previous prime is 56891988833. The next prime is 56891988883. The reversal of 56891988847 is 74888919865.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 56891988847 - 2¹¹ = 56891986799 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 56891988847.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56891988817) 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, 28445994423 + 28445994424.

It is an arithmetic number, because the mean of its divisors is an integer number (28445994424).

Almost surely, 2^56891988847 is an apocalyptic number.

56891988847 is a deficient number, since it is larger than the sum of its proper divisors (1).

56891988847 is an equidigital number, since it uses as much as digits as its factorization.

56891988847 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 278691840, while the sum is 73.

The spelling of 56891988847 in words is "fifty-six billion, eight hundred ninety-one million, nine hundred eighty-eight thousand, eight hundred forty-seven".