670999897 has 2 divisors, whose sum is σ = 670999898. Its totient is φ = 670999896.

The previous prime is 670999873. The next prime is 670999919. The reversal of 670999897 is 798999076.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 493017616 + 177982281 = 22204^2 + 13341^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-670999897 is a prime.

It is a super-4 number, since 4×670999897⁴ (a number of 36 digits) contains 4444 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (670999807) 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, 335499948 + 335499949.

It is an arithmetic number, because the mean of its divisors is an integer number (335499949).

Almost surely, 2^670999897 is an apocalyptic number.

It is an amenable number.

670999897 is a deficient number, since it is larger than the sum of its proper divisors (1).

670999897 is an equidigital number, since it uses as much as digits as its factorization.

670999897 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15431472, while the sum is 64.

The square root of 670999897 is about 25903.6657058417. The cubic root of 670999897 is about 875.4690913847.

The spelling of 670999897 in words is "six hundred seventy million, nine hundred ninety-nine thousand, eight hundred ninety-seven".