670567217921 has 2 divisors, whose sum is σ = 670567217922. Its totient is φ = 670567217920.

The previous prime is 670567217869. The next prime is 670567217941. The reversal of 670567217921 is 129712765076.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 529927217521 + 140640000400 = 727961^2 + 375020^2 .

It is a cyclic number.

It is not a de Polignac number, because 670567217921 - 2¹⁰ = 670567216897 is a prime.

It is not a weakly prime, because it can be changed into another prime (670567217941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 335283608960 + 335283608961.

It is an arithmetic number, because the mean of its divisors is an integer number (335283608961).

Almost surely, 2^670567217921 is an apocalyptic number.

It is an amenable number.

670567217921 is a deficient number, since it is larger than the sum of its proper divisors (1).

670567217921 is an equidigital number, since it uses as much as digits as its factorization.

670567217921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2222640, while the sum is 53.

The spelling of 670567217921 in words is "six hundred seventy billion, five hundred sixty-seven million, two hundred seventeen thousand, nine hundred twenty-one".