55532777809 has 4 divisors (see below), whose sum is σ = 55970043904. Its totient is φ = 55095511716.

The previous prime is 55532777771. The next prime is 55532777821. The reversal of 55532777809 is 90877723555.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 90877723555 = 5 ⋅18175544711.

It is a cyclic number.

It is not a de Polignac number, because 55532777809 - 2⁷ = 55532777681 is a prime.

It is a super-2 number, since 2×55532777809² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55532777899) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 218632857 + ... + 218633110.

It is an arithmetic number, because the mean of its divisors is an integer number (13992510976).

Almost surely, 2^55532777809 is an apocalyptic number.

It is an amenable number.

55532777809 is a deficient number, since it is larger than the sum of its proper divisors (437266095).

55532777809 is a wasteful number, since it uses less digits than its factorization.

55532777809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 437266094.

The product of its (nonzero) digits is 18522000, while the sum is 58.

The spelling of 55532777809 in words is "fifty-five billion, five hundred thirty-two million, seven hundred seventy-seven thousand, eight hundred nine".