669392813 has 4 divisors (see below), whose sum is σ = 669521760. Its totient is φ = 669263868.

The previous prime is 669392803. The next prime is 669392849. The reversal of 669392813 is 318293966.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 669392813 - 2⁴ = 669392797 is a prime.

It is a super-3 number, since 3×669392813³ (a number of 27 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (669392803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 56345 + ... + 67182.

It is an arithmetic number, because the mean of its divisors is an integer number (167380440).

Almost surely, 2^669392813 is an apocalyptic number.

It is an amenable number.

669392813 is a deficient number, since it is larger than the sum of its proper divisors (128947).

669392813 is a wasteful number, since it uses less digits than its factorization.

669392813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128946.

The product of its digits is 419904, while the sum is 47.

The square root of 669392813 is about 25872.6267124156. The cubic root of 669392813 is about 874.7695994190.

The spelling of 669392813 in words is "six hundred sixty-nine million, three hundred ninety-two thousand, eight hundred thirteen".