55500550477 has 2 divisors, whose sum is σ = 55500550478. Its totient is φ = 55500550476.

The previous prime is 55500550451. The next prime is 55500550507. The reversal of 55500550477 is 77405500555.

It is a happy number.

55500550477 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 43095268836 + 12405281641 = 207594^2 + 111379^2 .

It is a cyclic number.

It is not a de Polignac number, because 55500550477 - 2¹⁹ = 55500026189 is a prime.

It is a super-2 number, since 2×55500550477² (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 (55500550577) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27750275238 + 27750275239.

It is an arithmetic number, because the mean of its divisors is an integer number (27750275239).

Almost surely, 2^55500550477 is an apocalyptic number.

It is an amenable number.

55500550477 is a deficient number, since it is larger than the sum of its proper divisors (1).

55500550477 is an equidigital number, since it uses as much as digits as its factorization.

55500550477 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 612500, while the sum is 43.

The spelling of 55500550477 in words is "fifty-five billion, five hundred million, five hundred fifty thousand, four hundred seventy-seven".