56721000911 has 2 divisors, whose sum is σ = 56721000912. Its totient is φ = 56721000910.

The previous prime is 56721000863. The next prime is 56721000937. The reversal of 56721000911 is 11900012765.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 56721000911 - 2¹⁰ = 56720999887 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56721000961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28360500455 + 28360500456.

It is an arithmetic number, because the mean of its divisors is an integer number (28360500456).

Almost surely, 2^56721000911 is an apocalyptic number.

56721000911 is a deficient number, since it is larger than the sum of its proper divisors (1).

56721000911 is an equidigital number, since it uses as much as digits as its factorization.

56721000911 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3780, while the sum is 32.

The spelling of 56721000911 in words is "fifty-six billion, seven hundred twenty-one million, nine hundred eleven", and thus it is an aban number.