669919347 has 24 divisors (see below), whose sum is σ = 1025466000. Its totient is φ = 420251328.

The previous prime is 669919339. The next prime is 669919361. The reversal of 669919347 is 743919966.

It is not a de Polignac number, because 669919347 - 2³ = 669919339 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 669919293 and 669919302.

It is not an unprimeable number, because it can be changed into a prime (669919307) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 12333 + ... + 38625.

It is an arithmetic number, because the mean of its divisors is an integer number (42727750).

Almost surely, 2^669919347 is an apocalyptic number.

669919347 is a deficient number, since it is larger than the sum of its proper divisors (355546653).

669919347 is a wasteful number, since it uses less digits than its factorization.

669919347 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26467 (or 26464 counting only the distinct ones).

The product of its digits is 2204496, while the sum is 54.

The square root of 669919347 is about 25882.8002155872. The cubic root of 669919347 is about 874.9988993728.

The spelling of 669919347 in words is "six hundred sixty-nine million, nine hundred nineteen thousand, three hundred forty-seven".