641166601 has 2 divisors, whose sum is σ = 641166602. Its totient is φ = 641166600.

The previous prime is 641166587. The next prime is 641166613. The reversal of 641166601 is 106661146.

641166601 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 608115600 + 33051001 = 24660^2 + 5749^2 .

It is a cyclic number.

It is not a de Polignac number, because 641166601 - 2⁹ = 641166089 is a prime.

It is a super-2 number, since 2×641166601² = 822189220475786402, which contains 22 as substring.

It is equal to p_33358126 and since 641166601 and 33358126 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (641166661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320583300 + 320583301.

It is an arithmetic number, because the mean of its divisors is an integer number (320583301).

Almost surely, 2^641166601 is an apocalyptic number.

It is an amenable number.

641166601 is a deficient number, since it is larger than the sum of its proper divisors (1).

641166601 is an equidigital number, since it uses as much as digits as its factorization.

641166601 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 641166601 is about 25321.2677605210. The cubic root of 641166601 is about 862.2971760285.

The spelling of 641166601 in words is "six hundred forty-one million, one hundred sixty-six thousand, six hundred one".