669739785 has 32 divisors (see below), whose sum is σ = 1258927488. Its totient is φ = 299742720.

The previous prime is 669739771. The next prime is 669739793. The reversal of 669739785 is 587937966.

It is not a de Polignac number, because 669739785 - 2⁷ = 669739657 is a prime.

It is a super-2 number, since 2×669739785² = 897102759223692450, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 153972 + ... + 158261.

It is an arithmetic number, because the mean of its divisors is an integer number (39341484).

Almost surely, 2^669739785 is an apocalyptic number.

669739785 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

669739785 is a deficient number, since it is larger than the sum of its proper divisors (589187703).

669739785 is a wasteful number, since it uses less digits than its factorization.

669739785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 312265.

The product of its digits is 17146080, while the sum is 60.

The square root of 669739785 is about 25879.3312316992. The cubic root of 669739785 is about 874.9207155373.

The spelling of 669739785 in words is "six hundred sixty-nine million, seven hundred thirty-nine thousand, seven hundred eighty-five".