689883496821 has 8 divisors (see below), whose sum is σ = 1022049624960. Its totient is φ = 459922331196.

The previous prime is 689883496817. The next prime is 689883496829. The reversal of 689883496821 is 128694388986.

It is not a de Polignac number, because 689883496821 - 2² = 689883496817 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 689883496821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (689883496829) 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, 12775620285 + ... + 12775620338.

It is an arithmetic number, because the mean of its divisors is an integer number (127756203120).

Almost surely, 2^689883496821 is an apocalyptic number.

It is an amenable number.

689883496821 is a deficient number, since it is larger than the sum of its proper divisors (332166128139).

689883496821 is a wasteful number, since it uses less digits than its factorization.

689883496821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25551240632 (or 25551240626 counting only the distinct ones).

The product of its digits is 286654464, while the sum is 72.

The spelling of 689883496821 in words is "six hundred eighty-nine billion, eight hundred eighty-three million, four hundred ninety-six thousand, eight hundred twenty-one".