55387447799 has 4 divisors (see below), whose sum is σ = 55391867040. Its totient is φ = 55383028560.

The previous prime is 55387447781. The next prime is 55387447823. The reversal of 55387447799 is 99774478355.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99774478355 = 5 ⋅19954895671.

It is a cyclic number.

It is not a de Polignac number, because 55387447799 - 2⁸ = 55387447543 is a prime.

It is a super-3 number, since 3×55387447799³ (a number of 33 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55387447099) 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, 2190767 + ... + 2215904.

It is an arithmetic number, because the mean of its divisors is an integer number (13847966760).

Almost surely, 2^55387447799 is an apocalyptic number.

55387447799 is a deficient number, since it is larger than the sum of its proper divisors (4419241).

55387447799 is a wasteful number, since it uses less digits than its factorization.

55387447799 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4419240.

The product of its digits is 266716800, while the sum is 68.

The spelling of 55387447799 in words is "fifty-five billion, three hundred eighty-seven million, four hundred forty-seven thousand, seven hundred ninety-nine".