641312453549 has 2 divisors, whose sum is σ = 641312453550. Its totient is φ = 641312453548.

The previous prime is 641312453503. The next prime is 641312453591. The reversal of 641312453549 is 945354213146.

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., 482999980324 + 158312473225 = 694982^2 + 397885^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-641312453549 is a prime.

It is a super-2 number, since 2×641312453549² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (641312413549) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320656226774 + 320656226775.

It is an arithmetic number, because the mean of its divisors is an integer number (320656226775).

Almost surely, 2^641312453549 is an apocalyptic number.

It is an amenable number.

641312453549 is a deficient number, since it is larger than the sum of its proper divisors (1).

641312453549 is an equidigital number, since it uses as much as digits as its factorization.

641312453549 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1555200, while the sum is 47.

The spelling of 641312453549 in words is "six hundred forty-one billion, three hundred twelve million, four hundred fifty-three thousand, five hundred forty-nine".