669649374 has 24 divisors (see below), whose sum is σ = 1451648952. Its totient is φ = 223102320.

The previous prime is 669649339. The next prime is 669649391. The reversal of 669649374 is 473946966.

669649374 is a `hidden beast` number, since 66 + 96 + 493 + 7 + 4 = 666.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 669649374.

It is a congruent number.

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 11 ways as a sum of consecutive naturals, for example, 31429 + ... + 48239.

It is an arithmetic number, because the mean of its divisors is an integer number (60485373).

Almost surely, 2^669649374 is an apocalyptic number.

669649374 is an abundant number, since it is smaller than the sum of its proper divisors (781999578).

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

669649374 is a wasteful number, since it uses less digits than its factorization.

669649374 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19032 (or 19029 counting only the distinct ones).

The product of its digits is 5878656, while the sum is 54.

The square root of 669649374 is about 25877.5843926747. The cubic root of 669649374 is about 874.8813440190.

The spelling of 669649374 in words is "six hundred sixty-nine million, six hundred forty-nine thousand, three hundred seventy-four".