55576811987 has 4 divisors (see below), whose sum is σ = 55577318400. Its totient is φ = 55576305576.

The previous prime is 55576811923. The next prime is 55576811999. The reversal of 55576811987 is 78911867555.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 55576811987 - 2⁶ = 55576811923 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55576817987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11987 + ... + 333612.

It is an arithmetic number, because the mean of its divisors is an integer number (13894329600).

Almost surely, 2^55576811987 is an apocalyptic number.

55576811987 is a deficient number, since it is larger than the sum of its proper divisors (506413).

55576811987 is a wasteful number, since it uses less digits than its factorization.

55576811987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 506412.

The product of its digits is 21168000, while the sum is 62.

The spelling of 55576811987 in words is "fifty-five billion, five hundred seventy-six million, eight hundred eleven thousand, nine hundred eighty-seven".