669381763 has 8 divisors (see below), whose sum is σ = 688306160. Its totient is φ = 650501280.

The previous prime is 669381751. The next prime is 669381767. The reversal of 669381763 is 367183966.

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

It is a cyclic number.

It is not a de Polignac number, because 669381763 - 2¹³ = 669373571 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (669381767) 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 7 ways as a sum of consecutive naturals, for example, 21253 + ... + 42313.

It is an arithmetic number, because the mean of its divisors is an integer number (86038270).

Almost surely, 2^669381763 is an apocalyptic number.

669381763 is a deficient number, since it is larger than the sum of its proper divisors (18924397).

669381763 is a wasteful number, since it uses less digits than its factorization.

669381763 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21957.

The product of its digits is 979776, while the sum is 49.

The square root of 669381763 is about 25872.4131653775. The cubic root of 669381763 is about 874.7647859736.

The spelling of 669381763 in words is "six hundred sixty-nine million, three hundred eighty-one thousand, seven hundred sixty-three".