1663247427679 has 4 divisors (see below), whose sum is σ = 1663266460576. Its totient is φ = 1663228394784.

The previous prime is 1663247427649. The next prime is 1663247427727. The reversal of 1663247427679 is 9767247423661.

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 1663247427679 - 2¹³ = 1663247419487 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1663247427679.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1663247427649) 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, 9384759 + ... + 9560344.

It is an arithmetic number, because the mean of its divisors is an integer number (415816615144).

Almost surely, 2^{1663247427679} is an apocalyptic number.

1663247427679 is a deficient number, since it is larger than the sum of its proper divisors (19032897).

1663247427679 is an equidigital number, since it uses as much as digits as its factorization.

1663247427679 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19032896.

The product of its digits is 128024064, while the sum is 64.

The spelling of 1663247427679 in words is "one trillion, six hundred sixty-three billion, two hundred forty-seven million, four hundred twenty-seven thousand, six hundred seventy-nine".