55077756781 has 2 divisors, whose sum is σ = 55077756782. Its totient is φ = 55077756780.

The previous prime is 55077756737. The next prime is 55077756821. The reversal of 55077756781 is 18765777055.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 50944552681 + 4133204100 = 225709^2 + 64290^2 .

It is a cyclic number.

It is not a de Polignac number, because 55077756781 - 2¹⁹ = 55077232493 is a prime.

It is a super-2 number, since 2×55077756781² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55077756581) 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, 27538878390 + 27538878391.

It is an arithmetic number, because the mean of its divisors is an integer number (27538878391).

Almost surely, 2^55077756781 is an apocalyptic number.

It is an amenable number.

55077756781 is a deficient number, since it is larger than the sum of its proper divisors (1).

55077756781 is an equidigital number, since it uses as much as digits as its factorization.

55077756781 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14406000, while the sum is 58.

The spelling of 55077756781 in words is "fifty-five billion, seventy-seven million, seven hundred fifty-six thousand, seven hundred eighty-one".