55861336821 has 16 divisors (see below), whose sum is σ = 79730726400. Its totient is φ = 34682861808.

The previous prime is 55861336799. The next prime is 55861336907. The reversal of 55861336821 is 12863316855.

It is not a de Polignac number, because 55861336821 - 2⁶ = 55861336757 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55861331821) 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 15 ways as a sum of consecutive naturals, for example, 8301921 + ... + 8308646.

It is an arithmetic number, because the mean of its divisors is an integer number (4983170400).

Almost surely, 2^55861336821 is an apocalyptic number.

It is an amenable number.

55861336821 is a deficient number, since it is larger than the sum of its proper divisors (23869389579).

55861336821 is a wasteful number, since it uses less digits than its factorization.

55861336821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16610648.

The product of its digits is 1036800, while the sum is 48.

The spelling of 55861336821 in words is "fifty-five billion, eight hundred sixty-one million, three hundred thirty-six thousand, eight hundred twenty-one".