6461221783 has 2 divisors, whose sum is σ = 6461221784. Its totient is φ = 6461221782.

The previous prime is 6461221777. The next prime is 6461221787. The reversal of 6461221783 is 3871221646.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6461221783 is a prime.

It is a super-2 number, since 2×6461221783² = 83494773858227398178, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6461221787) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3230610891 + 3230610892.

It is an arithmetic number, because the mean of its divisors is an integer number (3230610892).

Almost surely, 2^6461221783 is an apocalyptic number.

6461221783 is a deficient number, since it is larger than the sum of its proper divisors (1).

6461221783 is an equidigital number, since it uses as much as digits as its factorization.

6461221783 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 96768, while the sum is 40.

The square root of 6461221783 is about 80381.7254293537. The cubic root of 6461221783 is about 1862.5368881663.

The spelling of 6461221783 in words is "six billion, four hundred sixty-one million, two hundred twenty-one thousand, seven hundred eighty-three".