55206707788821 has 16 divisors (see below), whose sum is σ = 73675503304704. Its totient is φ = 36771202907184.

The previous prime is 55206707788819. The next prime is 55206707788853. The reversal of 55206707788821 is 12888770760255.

It is not a de Polignac number, because 55206707788821 - 2¹ = 55206707788819 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55206707788811) 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, 19063660 + ... + 21767786.

It is an arithmetic number, because the mean of its divisors is an integer number (4604718956544).

Almost surely, 2^{55206707788821} is an apocalyptic number.

It is an amenable number.

55206707788821 is a deficient number, since it is larger than the sum of its proper divisors (18468795515883).

55206707788821 is a wasteful number, since it uses less digits than its factorization.

55206707788821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2710280.

The product of its (nonzero) digits is 105369600, while the sum is 66.

The spelling of 55206707788821 in words is "fifty-five trillion, two hundred six billion, seven hundred seven million, seven hundred eighty-eight thousand, eight hundred twenty-one".