689655499 has 4 divisors (see below), whose sum is σ = 742705936. Its totient is φ = 636605064.

The previous prime is 689655497. The next prime is 689655503. The reversal of 689655499 is 994556986.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 689655499 - 2¹ = 689655497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (689655493) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26525199 + ... + 26525224.

It is an arithmetic number, because the mean of its divisors is an integer number (185676484).

Almost surely, 2^689655499 is an apocalyptic number.

689655499 is a deficient number, since it is larger than the sum of its proper divisors (53050437).

689655499 is a wasteful number, since it uses less digits than its factorization.

689655499 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53050436.

The product of its digits is 20995200, while the sum is 61.

The square root of 689655499 is about 26261.2927899599. The cubic root of 689655499 is about 883.5085048430.

The spelling of 689655499 in words is "six hundred eighty-nine million, six hundred fifty-five thousand, four hundred ninety-nine".