6391401443561 has 2 divisors, whose sum is σ = 6391401443562. Its totient is φ = 6391401443560.

The previous prime is 6391401443533. The next prime is 6391401443591. The reversal of 6391401443561 is 1653441041936.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3664755066025 + 2726646377536 = 1914355^2 + 1651256^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6391401443561 is a prime.

It is not a weakly prime, because it can be changed into another prime (6391401443591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3195700721780 + 3195700721781.

It is an arithmetic number, because the mean of its divisors is an integer number (3195700721781).

Almost surely, 2^{6391401443561} is an apocalyptic number.

It is an amenable number.

6391401443561 is a deficient number, since it is larger than the sum of its proper divisors (1).

6391401443561 is an equidigital number, since it uses as much as digits as its factorization.

6391401443561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 933120, while the sum is 47.

The spelling of 6391401443561 in words is "six trillion, three hundred ninety-one billion, four hundred one million, four hundred forty-three thousand, five hundred sixty-one".