1964594942593 has 4 divisors (see below), whose sum is σ = 1977780143700. Its totient is φ = 1951409741488.

The previous prime is 1964594942521. The next prime is 1964594942623. The reversal of 1964594942593 is 3952494954691.

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

It can be written as a sum of positive squares in 2 ways, for example, as 159366228849 + 1805228713744 = 399207^2 + 1343588^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1964594942593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1964594942503) 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, 6592600330 + ... + 6592600627.

It is an arithmetic number, because the mean of its divisors is an integer number (494445035925).

Almost surely, 2^{1964594942593} is an apocalyptic number.

It is an amenable number.

1964594942593 is a deficient number, since it is larger than the sum of its proper divisors (13185201107).

1964594942593 is a wasteful number, since it uses less digits than its factorization.

1964594942593 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13185201106.

The product of its digits is 377913600, while the sum is 70.

The spelling of 1964594942593 in words is "one trillion, nine hundred sixty-four billion, five hundred ninety-four million, nine hundred forty-two thousand, five hundred ninety-three".