1663356452666 has 4 divisors (see below), whose sum is σ = 2495034679002. Its totient is φ = 831678226332.

The previous prime is 1663356452651. The next prime is 1663356452717. The reversal of 1663356452666 is 6662546533661.

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

It can be written as a sum of positive squares in only one way, i.e., 1074185072041 + 589171380625 = 1036429^2 + 767575^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 415839113165 + ... + 415839113168.

Almost surely, 2^{1663356452666} is an apocalyptic number.

1663356452666 is a deficient number, since it is larger than the sum of its proper divisors (831678226336).

1663356452666 is an equidigital number, since it uses as much as digits as its factorization.

1663356452666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 831678226335.

The product of its digits is 83980800, while the sum is 59.

The spelling of 1663356452666 in words is "one trillion, six hundred sixty-three billion, three hundred fifty-six million, four hundred fifty-two thousand, six hundred sixty-six".