887116778821 has 24 divisors (see below), whose sum is σ = 1098106813440. Its totient is φ = 701720899776.

The previous prime is 887116778803. The next prime is 887116778921. The reversal of 887116778821 is 128877611788.

It is a happy number.

887116778821 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 887116778821 - 2⁵ = 887116778789 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (887116778221) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4798620 + ... + 4980058.

It is an arithmetic number, because the mean of its divisors is an integer number (45754450560).

Almost surely, 2^887116778821 is an apocalyptic number.

It is an amenable number.

887116778821 is a deficient number, since it is larger than the sum of its proper divisors (210990034619).

887116778821 is a wasteful number, since it uses less digits than its factorization.

887116778821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 185605 (or 185592 counting only the distinct ones).

The product of its digits is 16859136, while the sum is 64.

The spelling of 887116778821 in words is "eight hundred eighty-seven billion, one hundred sixteen million, seven hundred seventy-eight thousand, eight hundred twenty-one".