55209986775 has 30 divisors (see below), whose sum is σ = 102267984192. Its totient is φ = 29445325200.

The previous prime is 55209986773. The next prime is 55209986917. The reversal of 55209986775 is 57768990255.

55209986775 is a `hidden beast` number, since 552 + 0 + 9 + 9 + 8 + 6 + 7 + 75 = 666.

It is not a de Polignac number, because 55209986775 - 2¹ = 55209986773 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55209986773) by changing a digit.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 13630071 + ... + 13634120.

Almost surely, 2^55209986775 is an apocalyptic number.

55209986775 is a deficient number, since it is larger than the sum of its proper divisors (47057997417).

55209986775 is a wasteful number, since it uses less digits than its factorization.

55209986775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27264213 (or 27264199 counting only the distinct ones).

The product of its (nonzero) digits is 47628000, while the sum is 63.

The spelling of 55209986775 in words is "fifty-five billion, two hundred nine million, nine hundred eighty-six thousand, seven hundred seventy-five".