669610855 has 4 divisors (see below), whose sum is σ = 803533032. Its totient is φ = 535688680.

The previous prime is 669610853. The next prime is 669610889. The reversal of 669610855 is 558016966.

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

It is not a de Polignac number, because 669610855 - 2¹ = 669610853 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (669610853) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66961081 + ... + 66961090.

It is an arithmetic number, because the mean of its divisors is an integer number (200883258).

Almost surely, 2^669610855 is an apocalyptic number.

669610855 is a deficient number, since it is larger than the sum of its proper divisors (133922177).

669610855 is a wasteful number, since it uses less digits than its factorization.

669610855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133922176.

The product of its (nonzero) digits is 388800, while the sum is 46.

The square root of 669610855 is about 25876.8401278054. The cubic root of 669610855 is about 874.8645689713.

It can be divided in two parts, 669 and 610855, that added together give a square (611524 = 782²).

The spelling of 669610855 in words is "six hundred sixty-nine million, six hundred ten thousand, eight hundred fifty-five".