6985885821 has 8 divisors (see below), whose sum is σ = 9315114144. Its totient is φ = 4656957360.

The previous prime is 6985885801. The next prime is 6985885877. The reversal of 6985885821 is 1285885896.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 6985885821 - 2⁶ = 6985885757 is a prime.

It is a super-5 number, since 5×6985885821⁵ (a number of 50 digits) contains 55555 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6985885801) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13375 + ... + 118956.

It is an arithmetic number, because the mean of its divisors is an integer number (1164389268).

Almost surely, 2^6985885821 is an apocalyptic number.

It is an amenable number.

6985885821 is a deficient number, since it is larger than the sum of its proper divisors (2329228323).

6985885821 is a wasteful number, since it uses less digits than its factorization.

6985885821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149931.

The product of its digits is 11059200, while the sum is 60.

The square root of 6985885821 is about 83581.6117396644. The cubic root of 6985885821 is about 1911.6446294430.

The spelling of 6985885821 in words is "six billion, nine hundred eighty-five million, eight hundred eighty-five thousand, eight hundred twenty-one".