1663121045423 has 4 divisors (see below), whose sum is σ = 1663150746648. Its totient is φ = 1663091344200.

The previous prime is 1663121045371. The next prime is 1663121045429. The reversal of 1663121045423 is 3245401213661.

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 1663121045423 - 2¹² = 1663121041327 is a prime.

It is a super-2 number, since 2×1663121045423² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1663121045429) 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, 14766461 + ... + 14878662.

It is an arithmetic number, because the mean of its divisors is an integer number (415787686662).

Almost surely, 2^{1663121045423} is an apocalyptic number.

1663121045423 is a deficient number, since it is larger than the sum of its proper divisors (29701225).

1663121045423 is an equidigital number, since it uses as much as digits as its factorization.

1663121045423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29701224.

The product of its (nonzero) digits is 103680, while the sum is 38.

The spelling of 1663121045423 in words is "one trillion, six hundred sixty-three billion, one hundred twenty-one million, forty-five thousand, four hundred twenty-three".