1956944456591 has 2 divisors, whose sum is σ = 1956944456592. Its totient is φ = 1956944456590.

The previous prime is 1956944456587. The next prime is 1956944456609. The reversal of 1956944456591 is 1956544496591.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1956944456591 - 2² = 1956944456587 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1956944456581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 978472228295 + 978472228296.

It is an arithmetic number, because the mean of its divisors is an integer number (978472228296).

Almost surely, 2^{1956944456591} is an apocalyptic number.

1956944456591 is a deficient number, since it is larger than the sum of its proper divisors (1).

1956944456591 is an equidigital number, since it uses as much as digits as its factorization.

1956944456591 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 209952000, while the sum is 68.

The spelling of 1956944456591 in words is "one trillion, nine hundred fifty-six billion, nine hundred forty-four million, four hundred fifty-six thousand, five hundred ninety-one".