1661564132341 has 8 divisors (see below), whose sum is σ = 1670299642368. Its totient is φ = 1652829000000.

The previous prime is 1661564132339. The next prime is 1661564132363. The reversal of 1661564132341 is 1432314651661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1661564132341 - 2¹ = 1661564132339 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1661564132311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15273741 + ... + 15382141.

It is an arithmetic number, because the mean of its divisors is an integer number (208787455296).

Almost surely, 2^{1661564132341} is an apocalyptic number.

It is an amenable number.

1661564132341 is a deficient number, since it is larger than the sum of its proper divisors (8735510027).

1661564132341 is a wasteful number, since it uses less digits than its factorization.

1661564132341 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 188843.

The product of its digits is 311040, while the sum is 43.

The spelling of 1661564132341 in words is "one trillion, six hundred sixty-one billion, five hundred sixty-four million, one hundred thirty-two thousand, three hundred forty-one".