1663366142381 has 2 divisors, whose sum is σ = 1663366142382. Its totient is φ = 1663366142380.

The previous prime is 1663366142363. The next prime is 1663366142387. The reversal of 1663366142381 is 1832416633661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 916023182281 + 747342960100 = 957091^2 + 864490^2 .

It is a cyclic number.

It is not a de Polignac number, because 1663366142381 - 2¹⁰ = 1663366141357 is a prime.

It is a super-2 number, since 2×1663366142381² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1663366142387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 831683071190 + 831683071191.

It is an arithmetic number, because the mean of its divisors is an integer number (831683071191).

Almost surely, 2^{1663366142381} is an apocalyptic number.

It is an amenable number.

1663366142381 is a deficient number, since it is larger than the sum of its proper divisors (1).

1663366142381 is an equidigital number, since it uses as much as digits as its factorization.

1663366142381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2239488, while the sum is 50.

The spelling of 1663366142381 in words is "one trillion, six hundred sixty-three billion, three hundred sixty-six million, one hundred forty-two thousand, three hundred eighty-one".