641124644023517 has 2 divisors, whose sum is σ = 641124644023518. Its totient is φ = 641124644023516.

The previous prime is 641124644023489. The next prime is 641124644023541. The reversal of 641124644023517 is 715320446421146.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 565722704825476 + 75401939198041 = 23784926^2 + 8683429^2 .

It is a cyclic number.

It is not a de Polignac number, because 641124644023517 - 2⁸ = 641124644023261 is a prime.

It is a super-2 number, since 2×641124644023517² (a number of 30 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (641124644023597) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320562322011758 + 320562322011759.

It is an arithmetic number, because the mean of its divisors is an integer number (320562322011759).

Almost surely, 2^{641124644023517} is an apocalyptic number.

It is an amenable number.

641124644023517 is a deficient number, since it is larger than the sum of its proper divisors (1).

641124644023517 is an equidigital number, since it uses as much as digits as its factorization.

641124644023517 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3870720, while the sum is 50.

The spelling of 641124644023517 in words is "six hundred forty-one trillion, one hundred twenty-four billion, six hundred forty-four million, twenty-three thousand, five hundred seventeen".