55785611477 has 2 divisors, whose sum is σ = 55785611478. Its totient is φ = 55785611476.

The previous prime is 55785611459. The next prime is 55785611543. The reversal of 55785611477 is 77411658755.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 52147832881 + 3637778596 = 228359^2 + 60314^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55785611477 is a prime.

It is a super-2 number, since 2×55785611477² (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 (55785611677) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27892805738 + 27892805739.

It is an arithmetic number, because the mean of its divisors is an integer number (27892805739).

Almost surely, 2^55785611477 is an apocalyptic number.

It is an amenable number.

55785611477 is a deficient number, since it is larger than the sum of its proper divisors (1).

55785611477 is an equidigital number, since it uses as much as digits as its factorization.

55785611477 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8232000, while the sum is 56.

The spelling of 55785611477 in words is "fifty-five billion, seven hundred eighty-five million, six hundred eleven thousand, four hundred seventy-seven".