6621461591 has 2 divisors, whose sum is σ = 6621461592. Its totient is φ = 6621461590.

The previous prime is 6621461543. The next prime is 6621461603. The reversal of 6621461591 is 1951641266.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6621461591 - 2⁶ = 6621461527 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6621461521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3310730795 + 3310730796.

It is an arithmetic number, because the mean of its divisors is an integer number (3310730796).

Almost surely, 2^6621461591 is an apocalyptic number.

6621461591 is a deficient number, since it is larger than the sum of its proper divisors (1).

6621461591 is an equidigital number, since it uses as much as digits as its factorization.

6621461591 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 77760, while the sum is 41.

The square root of 6621461591 is about 81372.3638036895. The cubic root of 6621461591 is about 1877.8084458575.

The spelling of 6621461591 in words is "six billion, six hundred twenty-one million, four hundred sixty-one thousand, five hundred ninety-one".