1964641914647 has 4 divisors (see below), whose sum is σ = 2006442806496. Its totient is φ = 1922841022800.

The previous prime is 1964641914619. The next prime is 1964641914691. The reversal of 1964641914647 is 7464191464691.

It is a happy number.

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 1964641914647 - 2¹⁰ = 1964641913623 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1964641914647.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1964641916647) 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, 20900445854 + ... + 20900445947.

It is an arithmetic number, because the mean of its divisors is an integer number (501610701624).

Almost surely, 2^{1964641914647} is an apocalyptic number.

1964641914647 is a deficient number, since it is larger than the sum of its proper divisors (41800891849).

1964641914647 is an equidigital number, since it uses as much as digits as its factorization.

1964641914647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41800891848.

The product of its digits is 31352832, while the sum is 62.

The spelling of 1964641914647 in words is "one trillion, nine hundred sixty-four billion, six hundred forty-one million, nine hundred fourteen thousand, six hundred forty-seven".