55206772686 has 72 divisors (see below), whose sum is σ = 129661361856. Its totient is φ = 16968631680.

The previous prime is 55206772679. The next prime is 55206772703. The reversal of 55206772686 is 68627760255.

55206772686 is a `hidden beast` number, since 552 + 0 + 6 + 7 + 7 + 2 + 6 + 86 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 3005466 + ... + 3023778.

It is an arithmetic number, because the mean of its divisors is an integer number (1800852248).

Almost surely, 2^55206772686 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55206772686, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (64830680928).

55206772686 is an abundant number, since it is smaller than the sum of its proper divisors (74454589170).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

55206772686 is a wasteful number, since it uses less digits than its factorization.

55206772686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19338 (or 19322 counting only the distinct ones).

The product of its (nonzero) digits is 8467200, while the sum is 54.

The spelling of 55206772686 in words is "fifty-five billion, two hundred six million, seven hundred seventy-two thousand, six hundred eighty-six".