1661564132363 has 2 divisors, whose sum is σ = 1661564132364. Its totient is φ = 1661564132362.

The previous prime is 1661564132339. The next prime is 1661564132369. The reversal of 1661564132363 is 3632314651661.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1661564132363 - 2⁶ = 1661564132299 is a prime.

It is not a weakly prime, because it can be changed into another prime (1661564132369) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 830782066181 + 830782066182.

It is an arithmetic number, because the mean of its divisors is an integer number (830782066182).

Almost surely, 2^{1661564132363} is an apocalyptic number.

1661564132363 is a deficient number, since it is larger than the sum of its proper divisors (1).

1661564132363 is an equidigital number, since it uses as much as digits as its factorization.

1661564132363 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1399680, while the sum is 47.

The spelling of 1661564132363 in words is "one trillion, six hundred sixty-one billion, five hundred sixty-four million, one hundred thirty-two thousand, three hundred sixty-three".