670636669 has 2 divisors, whose sum is σ = 670636670. Its totient is φ = 670636668.

The previous prime is 670636663. The next prime is 670636693. The reversal of 670636669 is 966636076.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 670292100 + 344569 = 25890^2 + 587^2 .

It is a cyclic number.

It is not a de Polignac number, because 670636669 - 2³ = 670636661 is a prime.

It is a super-2 number, since 2×670636669² = 899507083614831122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (670636661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 335318334 + 335318335.

It is an arithmetic number, because the mean of its divisors is an integer number (335318335).

Almost surely, 2^670636669 is an apocalyptic number.

It is an amenable number.

670636669 is a deficient number, since it is larger than the sum of its proper divisors (1).

670636669 is an equidigital number, since it uses as much as digits as its factorization.

670636669 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1469664, while the sum is 49.

The square root of 670636669 is about 25896.6536255169. The cubic root of 670636669 is about 875.3110922130.

The spelling of 670636669 in words is "six hundred seventy million, six hundred thirty-six thousand, six hundred sixty-nine".