887861653821 has 12 divisors (see below), whose sum is σ = 1282519798560. Its totient is φ = 591883323720.

The previous prime is 887861653817. The next prime is 887861653829. The reversal of 887861653821 is 128356168788.

887861653821 is a `hidden beast` number, since 8 + 8 + 7 + 8 + 616 + 5 + 3 + 8 + 2 + 1 = 666.

It is not a de Polignac number, because 887861653821 - 2² = 887861653817 is a prime.

It is a super-2 number, since 2×887861653821² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (887861653829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1805715 + ... + 2244176.

It is an arithmetic number, because the mean of its divisors is an integer number (106876649880).

Almost surely, 2^887861653821 is an apocalyptic number.

It is an amenable number.

887861653821 is a deficient number, since it is larger than the sum of its proper divisors (394658144739).

887861653821 is a wasteful number, since it uses less digits than its factorization.

887861653821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4074256 (or 4074253 counting only the distinct ones).

The product of its digits is 30965760, while the sum is 63.

The spelling of 887861653821 in words is "eight hundred eighty-seven billion, eight hundred sixty-one million, six hundred fifty-three thousand, eight hundred twenty-one".