671720747 has 2 divisors, whose sum is σ = 671720748. Its totient is φ = 671720746.

The previous prime is 671720659. The next prime is 671720809. The reversal of 671720747 is 747027176.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 671720747 - 2¹⁸ = 671458603 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (671720347) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 335860373 + 335860374.

It is an arithmetic number, because the mean of its divisors is an integer number (335860374).

Almost surely, 2^671720747 is an apocalyptic number.

671720747 is a deficient number, since it is larger than the sum of its proper divisors (1).

671720747 is an equidigital number, since it uses as much as digits as its factorization.

671720747 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 115248, while the sum is 41.

The square root of 671720747 is about 25917.5760247752. The cubic root of 671720747 is about 875.7824824116.

The spelling of 671720747 in words is "six hundred seventy-one million, seven hundred twenty thousand, seven hundred forty-seven".