75776426821 has 2 divisors, whose sum is σ = 75776426822. Its totient is φ = 75776426820.

The previous prime is 75776426813. The next prime is 75776426839. The reversal of 75776426821 is 12862467757.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 43812350596 + 31964076225 = 209314^2 + 178785^2 .

It is a cyclic number.

It is not a de Polignac number, because 75776426821 - 2³ = 75776426813 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (75776426881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37888213410 + 37888213411.

It is an arithmetic number, because the mean of its divisors is an integer number (37888213411).

Almost surely, 2^75776426821 is an apocalyptic number.

It is an amenable number.

75776426821 is a deficient number, since it is larger than the sum of its proper divisors (1).

75776426821 is an equidigital number, since it uses as much as digits as its factorization.

75776426821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7902720, while the sum is 55.

The spelling of 75776426821 in words is "seventy-five billion, seven hundred seventy-six million, four hundred twenty-six thousand, eight hundred twenty-one".