1964865647 has 2 divisors, whose sum is σ = 1964865648. Its totient is φ = 1964865646.

The previous prime is 1964865631. The next prime is 1964865667. The reversal of 1964865647 is 7465684691.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1964865647 - 2⁴ = 1964865631 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1964865592 and 1964865601.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1964865667) 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, 982432823 + 982432824.

It is an arithmetic number, because the mean of its divisors is an integer number (982432824).

Almost surely, 2^1964865647 is an apocalyptic number.

1964865647 is a deficient number, since it is larger than the sum of its proper divisors (1).

1964865647 is an equidigital number, since it uses as much as digits as its factorization.

1964865647 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8709120, while the sum is 56.

The square root of 1964865647 is about 44326.8050619487. The cubic root of 1964865647 is about 1252.4996693505.

The spelling of 1964865647 in words is "one billion, nine hundred sixty-four million, eight hundred sixty-five thousand, six hundred forty-seven".