689959665 has 24 divisors (see below), whose sum is σ = 1203104448. Its totient is φ = 365771040.

The previous prime is 689959663. The next prime is 689959679. The reversal of 689959665 is 566959986.

It is not a de Polignac number, because 689959665 - 2¹ = 689959663 is a prime.

It is not an unprimeable number, because it can be changed into a prime (689959663) 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, 38391 + ... + 53420.

It is an arithmetic number, because the mean of its divisors is an integer number (50129352).

Almost surely, 2^689959665 is an apocalyptic number.

It is an amenable number.

689959665 is a deficient number, since it is larger than the sum of its proper divisors (513144783).

689959665 is a wasteful number, since it uses less digits than its factorization.

689959665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91989 (or 91986 counting only the distinct ones).

The product of its digits is 31492800, while the sum is 63.

The square root of 689959665 is about 26267.0832983032. The cubic root of 689959665 is about 883.6383734274.

It can be divided in two parts, 6899 and 59665, that added together give a square (66564 = 258²).

The spelling of 689959665 in words is "six hundred eighty-nine million, nine hundred fifty-nine thousand, six hundred sixty-five".