646330311541 has 2 divisors, whose sum is σ = 646330311542. Its totient is φ = 646330311540.

The previous prime is 646330311491. The next prime is 646330311569. The reversal of 646330311541 is 145113033646.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 395038647441 + 251291664100 = 628521^2 + 501290^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-646330311541 is a prime.

It is a super-2 number, since 2×646330311541² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 646330311541.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (646330312541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323165155770 + 323165155771.

It is an arithmetic number, because the mean of its divisors is an integer number (323165155771).

Almost surely, 2^646330311541 is an apocalyptic number.

It is an amenable number.

646330311541 is a deficient number, since it is larger than the sum of its proper divisors (1).

646330311541 is an equidigital number, since it uses as much as digits as its factorization.

646330311541 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 77760, while the sum is 37.

The spelling of 646330311541 in words is "six hundred forty-six billion, three hundred thirty million, three hundred eleven thousand, five hundred forty-one".