1663453023545 has 4 divisors (see below), whose sum is σ = 1996143628260. Its totient is φ = 1330762418832.

The previous prime is 1663453023511. The next prime is 1663453023587. The reversal of 1663453023545 is 5453203543661.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 526789994809 + 1136663028736 = 725803^2 + 1066144^2 .

It is a cyclic number.

It is not a de Polignac number, because 1663453023545 - 2²² = 1663448829241 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1663453023545.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 166345302350 + ... + 166345302359.

It is an arithmetic number, because the mean of its divisors is an integer number (499035907065).

Almost surely, 2^{1663453023545} is an apocalyptic number.

It is an amenable number.

1663453023545 is a deficient number, since it is larger than the sum of its proper divisors (332690604715).

1663453023545 is an equidigital number, since it uses as much as digits as its factorization.

1663453023545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 332690604714.

The product of its (nonzero) digits is 3888000, while the sum is 47.

The spelling of 1663453023545 in words is "one trillion, six hundred sixty-three billion, four hundred fifty-three million, twenty-three thousand, five hundred forty-five".