641542245101 has 2 divisors, whose sum is σ = 641542245102. Its totient is φ = 641542245100.

The previous prime is 641542245083. The next prime is 641542245151. The reversal of 641542245101 is 101542245146.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 425461371076 + 216080874025 = 652274^2 + 464845^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-641542245101 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (641542245151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320771122550 + 320771122551.

It is an arithmetic number, because the mean of its divisors is an integer number (320771122551).

Almost surely, 2^641542245101 is an apocalyptic number.

It is an amenable number.

641542245101 is a deficient number, since it is larger than the sum of its proper divisors (1).

641542245101 is an equidigital number, since it uses as much as digits as its factorization.

641542245101 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 38400, while the sum is 35.

The spelling of 641542245101 in words is "six hundred forty-one billion, five hundred forty-two million, two hundred forty-five thousand, one hundred one".