56194461821 has 2 divisors, whose sum is σ = 56194461822. Its totient is φ = 56194461820.

The previous prime is 56194461781. The next prime is 56194461859. The reversal of 56194461821 is 12816449165.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 51945247225 + 4249214596 = 227915^2 + 65186^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-56194461821 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56194466821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28097230910 + 28097230911.

It is an arithmetic number, because the mean of its divisors is an integer number (28097230911).

Almost surely, 2^56194461821 is an apocalyptic number.

It is an amenable number.

56194461821 is a deficient number, since it is larger than the sum of its proper divisors (1).

56194461821 is an equidigital number, since it uses as much as digits as its factorization.

56194461821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 414720, while the sum is 47.

The spelling of 56194461821 in words is "fifty-six billion, one hundred ninety-four million, four hundred sixty-one thousand, eight hundred twenty-one".