1663971313073 has 8 divisors (see below), whose sum is σ = 1703655518592. Its totient is φ = 1624465464336.

The previous prime is 1663971312967. The next prime is 1663971313091. The reversal of 1663971313073 is 3703131793661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1663971313073 - 2¹² = 1663971308977 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1663971313373) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44570315 + ... + 44607632.

It is an arithmetic number, because the mean of its divisors is an integer number (212956939824).

Almost surely, 2^{1663971313073} is an apocalyptic number.

It is an amenable number.

1663971313073 is a deficient number, since it is larger than the sum of its proper divisors (39684205519).

1663971313073 is an equidigital number, since it uses as much as digits as its factorization.

1663971313073 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89178391.

The product of its (nonzero) digits is 1285956, while the sum is 50.

The spelling of 1663971313073 in words is "one trillion, six hundred sixty-three billion, nine hundred seventy-one million, three hundred thirteen thousand, seventy-three".