55511545447 has 4 divisors (see below), whose sum is σ = 55636854120. Its totient is φ = 55386236776.

The previous prime is 55511545433. The next prime is 55511545451. The reversal of 55511545447 is 74454511555.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 74454511555 = 5 ⋅14890902311.

It is a cyclic number.

It is not a de Polignac number, because 55511545447 - 2⁷ = 55511545319 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 55511545397 and 55511545406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55511545457) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 62653672 + ... + 62654557.

It is an arithmetic number, because the mean of its divisors is an integer number (13909213530).

Almost surely, 2^55511545447 is an apocalyptic number.

55511545447 is a deficient number, since it is larger than the sum of its proper divisors (125308673).

55511545447 is a wasteful number, since it uses less digits than its factorization.

55511545447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125308672.

The product of its digits is 1400000, while the sum is 46.

The spelling of 55511545447 in words is "fifty-five billion, five hundred eleven million, five hundred forty-five thousand, four hundred forty-seven".