669339478 has 4 divisors (see below), whose sum is σ = 1004009220. Its totient is φ = 334669738.

The previous prime is 669339457. The next prime is 669339499. The reversal of 669339478 is 874933966.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 874933966 = 2 ⋅437466983.

It is an interprime number because it is at equal distance from previous prime (669339457) and next prime (669339499).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 167334868 + ... + 167334871.

It is an arithmetic number, because the mean of its divisors is an integer number (251002305).

Almost surely, 2^669339478 is an apocalyptic number.

669339478 is a deficient number, since it is larger than the sum of its proper divisors (334669742).

669339478 is a wasteful number, since it uses less digits than its factorization.

669339478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 334669741.

The product of its digits is 5878656, while the sum is 55.

The square root of 669339478 is about 25871.5959693251. The cubic root of 669339478 is about 874.7463658882.

The spelling of 669339478 in words is "six hundred sixty-nine million, three hundred thirty-nine thousand, four hundred seventy-eight".