670661401 has 2 divisors, whose sum is σ = 670661402. Its totient is φ = 670661400.

The previous prime is 670661399. The next prime is 670661419. The reversal of 670661401 is 104166076.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 442681600 + 227979801 = 21040^2 + 15099^2 .

It is a cyclic number.

It is not a de Polignac number, because 670661401 - 2¹ = 670661399 is a prime.

Together with 670661399, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (671661401) 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, 335330700 + 335330701.

It is an arithmetic number, because the mean of its divisors is an integer number (335330701).

Almost surely, 2^670661401 is an apocalyptic number.

It is an amenable number.

670661401 is a deficient number, since it is larger than the sum of its proper divisors (1).

670661401 is an equidigital number, since it uses as much as digits as its factorization.

670661401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6048, while the sum is 31.

The square root of 670661401 is about 25897.1311345485. The cubic root of 670661401 is about 875.3218521017.

The spelling of 670661401 in words is "six hundred seventy million, six hundred sixty-one thousand, four hundred one".