669839077 has 2 divisors, whose sum is σ = 669839078. Its totient is φ = 669839076.

The previous prime is 669839057. The next prime is 669839111. The reversal of 669839077 is 770938966.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 435932641 + 233906436 = 20879^2 + 15294^2 .

It is a cyclic number.

It is not a de Polignac number, because 669839077 - 2¹¹ = 669837029 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (669839047) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334919538 + 334919539.

It is an arithmetic number, because the mean of its divisors is an integer number (334919539).

Almost surely, 2^669839077 is an apocalyptic number.

It is an amenable number.

669839077 is a deficient number, since it is larger than the sum of its proper divisors (1).

669839077 is an equidigital number, since it uses as much as digits as its factorization.

669839077 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3429216, while the sum is 55.

The square root of 669839077 is about 25881.2495254769. The cubic root of 669839077 is about 874.9639504060.

The spelling of 669839077 in words is "six hundred sixty-nine million, eight hundred thirty-nine thousand, seventy-seven".