669801766 has 8 divisors (see below), whose sum is σ = 1004851224. Its totient is φ = 334851360.

The previous prime is 669801761. The next prime is 669801767. The reversal of 669801766 is 667108966.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (669801761) 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 3 ways as a sum of consecutive naturals, for example, 4560 + ... + 36883.

It is an arithmetic number, because the mean of its divisors is an integer number (125606403).

Almost surely, 2^669801766 is an apocalyptic number.

669801766 is a deficient number, since it is larger than the sum of its proper divisors (335049458).

669801766 is a wasteful number, since it uses less digits than its factorization.

669801766 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49526.

The product of its (nonzero) digits is 653184, while the sum is 49.

The square root of 669801766 is about 25880.5287040277. The cubic root of 669801766 is about 874.9477045208.

The spelling of 669801766 in words is "six hundred sixty-nine million, eight hundred one thousand, seven hundred sixty-six".