669855670 has 16 divisors (see below), whose sum is σ = 1315353168. Its totient is φ = 243583840.

The previous prime is 669855647. The next prime is 669855671. The reversal of 669855670 is 76558966.

It is a super-2 number, since 2×669855670² = 897413237262297800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (669855671) 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, 3044689 + ... + 3044908.

It is an arithmetic number, because the mean of its divisors is an integer number (82209573).

Almost surely, 2^669855670 is an apocalyptic number.

669855670 is a deficient number, since it is larger than the sum of its proper divisors (645497498).

669855670 is a wasteful number, since it uses less digits than its factorization.

669855670 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6089615.

The product of its (nonzero) digits is 2721600, while the sum is 52.

The square root of 669855670 is about 25881.5700837488. The cubic root of 669855670 is about 874.9711751049.

The spelling of 669855670 in words is "six hundred sixty-nine million, eight hundred fifty-five thousand, six hundred seventy".