670463891 has 2 divisors, whose sum is σ = 670463892. Its totient is φ = 670463890.

The previous prime is 670463879. The next prime is 670463897. The reversal of 670463891 is 198364076.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-670463891 is a prime.

It is not a weakly prime, because it can be changed into another prime (670463897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 335231945 + 335231946.

It is an arithmetic number, because the mean of its divisors is an integer number (335231946).

Almost surely, 2^670463891 is an apocalyptic number.

670463891 is a deficient number, since it is larger than the sum of its proper divisors (1).

670463891 is an equidigital number, since it uses as much as digits as its factorization.

670463891 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 217728, while the sum is 44.

The square root of 670463891 is about 25893.3174969914. The cubic root of 670463891 is about 875.2359161420.

The spelling of 670463891 in words is "six hundred seventy million, four hundred sixty-three thousand, eight hundred ninety-one".