641662867 has 2 divisors, whose sum is σ = 641662868. Its totient is φ = 641662866.

The previous prime is 641662837. The next prime is 641662871. The reversal of 641662867 is 768266146.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 641662867 - 2¹¹ = 641660819 is a prime.

It is not a weakly prime, because it can be changed into another prime (641662817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320831433 + 320831434.

It is an arithmetic number, because the mean of its divisors is an integer number (320831434).

Almost surely, 2^641662867 is an apocalyptic number.

641662867 is a deficient number, since it is larger than the sum of its proper divisors (1).

641662867 is an equidigital number, since it uses as much as digits as its factorization.

641662867 is an evil number, because the sum of its binary digits is even.

The product of its digits is 580608, while the sum is 46.

The square root of 641662867 is about 25331.0652559264. The cubic root of 641662867 is about 862.5195926936.

The spelling of 641662867 in words is "six hundred forty-one million, six hundred sixty-two thousand, eight hundred sixty-seven".