1973305316663 has 4 divisors (see below), whose sum is σ = 1973311225248. Its totient is φ = 1973299408080.

The previous prime is 1973305316623. The next prime is 1973305316677. The reversal of 1973305316663 is 3666135033791.

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 1973305316663 - 2⁸ = 1973305316407 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1973305316623) 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, 2421278 + ... + 3131963.

It is an arithmetic number, because the mean of its divisors is an integer number (493327806312).

Almost surely, 2^{1973305316663} is an apocalyptic number.

1973305316663 is a deficient number, since it is larger than the sum of its proper divisors (5908585).

1973305316663 is an equidigital number, since it uses as much as digits as its factorization.

1973305316663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5908584.

The product of its (nonzero) digits is 5511240, while the sum is 53.

The spelling of 1973305316663 in words is "one trillion, nine hundred seventy-three billion, three hundred five million, three hundred sixteen thousand, six hundred sixty-three".