1964694964691 has 4 divisors (see below), whose sum is σ = 1964722776432. Its totient is φ = 1964667152952.

The previous prime is 1964694964667. The next prime is 1964694964709.

1964694964691 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1964694964691 - 2³⁰ = 1963621222867 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1964694964651) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13799636 + ... + 13941281.

It is an arithmetic number, because the mean of its divisors is an integer number (491180694108).

Almost surely, 2^{1964694964691} is an apocalyptic number.

1964694964691 is a deficient number, since it is larger than the sum of its proper divisors (27811741).

1964694964691 is an equidigital number, since it uses as much as digits as its factorization.

1964694964691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27811740.

The product of its digits is 544195584, while the sum is 74.

The spelling of 1964694964691 in words is "one trillion, nine hundred sixty-four billion, six hundred ninety-four million, nine hundred sixty-four thousand, six hundred ninety-one".