55666667887 has 4 divisors (see below), whose sum is σ = 57024391536. Its totient is φ = 54308944240.

The previous prime is 55666667873. The next prime is 55666667911. The reversal of 55666667887 is 78876666655.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 55666667887 - 2⁷ = 55666667759 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55666667867) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 678861763 + ... + 678861844.

It is an arithmetic number, because the mean of its divisors is an integer number (14256097884).

Almost surely, 2^55666667887 is an apocalyptic number.

55666667887 is a deficient number, since it is larger than the sum of its proper divisors (1357723649).

55666667887 is a wasteful number, since it uses less digits than its factorization.

55666667887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1357723648.

The product of its digits is 609638400, while the sum is 70.

The spelling of 55666667887 in words is "fifty-five billion, six hundred sixty-six million, six hundred sixty-seven thousand, eight hundred eighty-seven".