56780217811 has 2 divisors, whose sum is σ = 56780217812. Its totient is φ = 56780217810.

The previous prime is 56780217713. The next prime is 56780217817. The reversal of 56780217811 is 11871208765.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 56780217811 - 2¹¹ = 56780215763 is a prime.

It is not a weakly prime, because it can be changed into another prime (56780217817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28390108905 + 28390108906.

It is an arithmetic number, because the mean of its divisors is an integer number (28390108906).

Almost surely, 2^56780217811 is an apocalyptic number.

56780217811 is a deficient number, since it is larger than the sum of its proper divisors (1).

56780217811 is an equidigital number, since it uses as much as digits as its factorization.

56780217811 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 188160, while the sum is 46.

The spelling of 56780217811 in words is "fifty-six billion, seven hundred eighty million, two hundred seventeen thousand, eight hundred eleven".