6667788887 has 4 divisors (see below), whose sum is σ = 6668400000. Its totient is φ = 6667177776.

The previous prime is 6667788859. The next prime is 6667788899. The reversal of 6667788887 is 7888877666.

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 6667788887 - 2¹⁶ = 6667723351 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6667788887.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6667788847) 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, 288887 + ... + 311112.

It is an arithmetic number, because the mean of its divisors is an integer number (1667100000).

Almost surely, 2^6667788887 is an apocalyptic number.

6667788887 is a deficient number, since it is larger than the sum of its proper divisors (611113).

6667788887 is a wasteful number, since it uses less digits than its factorization.

6667788887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 611112.

The product of its digits is 303464448, while the sum is 71.

The square root of 6667788887 is about 81656.5299715828. The cubic root of 6667788887 is about 1882.1776568136.

The spelling of 6667788887 in words is "six billion, six hundred sixty-seven million, seven hundred eighty-eight thousand, eight hundred eighty-seven".