1965615660647 has 4 divisors (see below), whose sum is σ = 2007437270496. Its totient is φ = 1923794050800.

The previous prime is 1965615660577. The next prime is 1965615660667. The reversal of 1965615660647 is 7460665165691.

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 1965615660647 - 2²⁴ = 1965598883431 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 1965615660647.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1965615660667) 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, 20910804854 + ... + 20910804947.

It is an arithmetic number, because the mean of its divisors is an integer number (501859317624).

Almost surely, 2^{1965615660647} is an apocalyptic number.

1965615660647 is a deficient number, since it is larger than the sum of its proper divisors (41821609849).

1965615660647 is an equidigital number, since it uses as much as digits as its factorization.

1965615660647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41821609848.

The product of its (nonzero) digits is 48988800, while the sum is 62.

It can be divided in two parts, 1965615 and 660647, that added together give a palindrome (2626262).

The spelling of 1965615660647 in words is "one trillion, nine hundred sixty-five billion, six hundred fifteen million, six hundred sixty thousand, six hundred forty-seven".