55278327791 has 16 divisors (see below), whose sum is σ = 56459785920. Its totient is φ = 54109036800.

The previous prime is 55278327781. The next prime is 55278327799. The reversal of 55278327791 is 19772387255.

It is a cyclic number.

It is not a de Polignac number, because 55278327791 - 2¹⁰ = 55278326767 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55278327799) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17778545 + ... + 17781653.

It is an arithmetic number, because the mean of its divisors is an integer number (3528736620).

Almost surely, 2^55278327791 is an apocalyptic number.

55278327791 is a deficient number, since it is larger than the sum of its proper divisors (1181458129).

55278327791 is a wasteful number, since it uses less digits than its factorization.

55278327791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4946.

The product of its digits is 7408800, while the sum is 56.

The spelling of 55278327791 in words is "fifty-five billion, two hundred seventy-eight million, three hundred twenty-seven thousand, seven hundred ninety-one".