669765077 has 8 divisors (see below), whose sum is σ = 673333560. Its totient is φ = 666205120.

The previous prime is 669765073. The next prime is 669765079. The reversal of 669765077 is 770567966.

It can be written as a sum of positive squares in 4 ways, for example, as 42436 + 669722641 = 206^2 + 25879^2 .

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 669765077 - 2² = 669765073 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (669765071) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 206327 + ... + 209547.

It is an arithmetic number, because the mean of its divisors is an integer number (84166695).

Almost surely, 2^669765077 is an apocalyptic number.

It is an amenable number.

669765077 is a deficient number, since it is larger than the sum of its proper divisors (3568483).

669765077 is a wasteful number, since it uses less digits than its factorization.

669765077 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4263.

The product of its (nonzero) digits is 3333960, while the sum is 53.

The square root of 669765077 is about 25879.8198795896. The cubic root of 669765077 is about 874.9317288774.

The spelling of 669765077 in words is "six hundred sixty-nine million, seven hundred sixty-five thousand, seventy-seven".