1821178606887 has 12 divisors (see below), whose sum is σ = 2630605378024. Its totient is φ = 1214112583440.

The previous prime is 1821178606867. The next prime is 1821178606921. The reversal of 1821178606887 is 7886068711281.

1821178606887 is a `hidden beast` number, since 1 + 8 + 2 + 1 + 17 + 8 + 606 + 8 + 8 + 7 = 666.

It is not a de Polignac number, because 1821178606887 - 2²⁰ = 1821177558311 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 (1821178606867) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1746312 + ... + 2586882.

Almost surely, 2^{1821178606887} is an apocalyptic number.

1821178606887 is a deficient number, since it is larger than the sum of its proper divisors (809426771137).

1821178606887 is a wasteful number, since it uses less digits than its factorization.

1821178606887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1081310 (or 1081307 counting only the distinct ones).

The product of its (nonzero) digits is 14450688, while the sum is 63.

The spelling of 1821178606887 in words is "one trillion, eight hundred twenty-one billion, one hundred seventy-eight million, six hundred six thousand, eight hundred eighty-seven".