669610518 has 16 divisors (see below), whose sum is σ = 1417998960. Its totient is φ = 210073856.

The previous prime is 669610517. The next prime is 669610537. The reversal of 669610518 is 815016966.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 669610518.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (669610511) 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, 3282303 + ... + 3282506.

It is an arithmetic number, because the mean of its divisors is an integer number (88624935).

Almost surely, 2^669610518 is an apocalyptic number.

669610518 is an abundant number, since it is smaller than the sum of its proper divisors (748388442).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

669610518 is a wasteful number, since it uses less digits than its factorization.

669610518 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6564831.

The product of its (nonzero) digits is 77760, while the sum is 42.

The square root of 669610518 is about 25876.8336161904. The cubic root of 669610518 is about 874.8644222047.

The spelling of 669610518 in words is "six hundred sixty-nine million, six hundred ten thousand, five hundred eighteen".