1964660664691 has 2 divisors, whose sum is σ = 1964660664692. Its totient is φ = 1964660664690.

The previous prime is 1964660664653. The next prime is 1964660664713.

1964660664691 is nontrivially palindromic in base 10.

It is a strong prime.

It is a palprime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1964660664691 is a prime.

It is not a weakly prime, because it can be changed into another prime (1964660664191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 982330332345 + 982330332346.

It is an arithmetic number, because the mean of its divisors is an integer number (982330332346).

Almost surely, 2^{1964660664691} is an apocalyptic number.

1964660664691 is a deficient number, since it is larger than the sum of its proper divisors (1).

1964660664691 is an equidigital number, since it uses as much as digits as its factorization.

1964660664691 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 60466176, while the sum is 64.

The spelling of 1964660664691 in words is "one trillion, nine hundred sixty-four billion, six hundred sixty million, six hundred sixty-four thousand, six hundred ninety-one".