669766705 has 4 divisors (see below), whose sum is σ = 803720052. Its totient is φ = 535813360.

The previous prime is 669766681. The next prime is 669766723. The reversal of 669766705 is 507667966.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 418734369 + 251032336 = 20463^2 + 15844^2 .

It is not a de Polignac number, because 669766705 - 2⁷ = 669766577 is a prime.

It is a Duffinian 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 3 ways as a sum of consecutive naturals, for example, 66976666 + ... + 66976675.

It is an arithmetic number, because the mean of its divisors is an integer number (200930013).

Almost surely, 2^669766705 is an apocalyptic number.

It is an amenable number.

669766705 is a deficient number, since it is larger than the sum of its proper divisors (133953347).

669766705 is a wasteful number, since it uses less digits than its factorization.

669766705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133953346.

The product of its (nonzero) digits is 2857680, while the sum is 52.

The square root of 669766705 is about 25879.8513326487. The cubic root of 669766705 is about 874.9324377766.

The spelling of 669766705 in words is "six hundred sixty-nine million, seven hundred sixty-six thousand, seven hundred five".