1663696003523 has 4 divisors (see below), whose sum is σ = 1699093790880. Its totient is φ = 1628298216168.

The previous prime is 1663696003517. The next prime is 1663696003537. The reversal of 1663696003523 is 3253006963661.

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 1663696003523 - 2⁸ = 1663696003267 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1663696009523) 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, 17698893608 + ... + 17698893701.

It is an arithmetic number, because the mean of its divisors is an integer number (424773447720).

Almost surely, 2^{1663696003523} is an apocalyptic number.

1663696003523 is a deficient number, since it is larger than the sum of its proper divisors (35397787357).

1663696003523 is an equidigital number, since it uses as much as digits as its factorization.

1663696003523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35397787356.

The product of its (nonzero) digits is 3149280, while the sum is 50.

The spelling of 1663696003523 in words is "one trillion, six hundred sixty-three billion, six hundred ninety-six million, three thousand, five hundred twenty-three".