1661564132342 has 16 divisors (see below), whose sum is σ = 2542110451920. Its totient is φ = 814277549568.

The previous prime is 1661564132339. The next prime is 1661564132363. The reversal of 1661564132342 is 2432314651661.

It is a junction number, because it is equal to n+sod(n) for n = 1661564132293 and 1661564132302.

It is a congruent number.

It is an unprimeable number.

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, 20852003 + ... + 20931534.

It is an arithmetic number, because the mean of its divisors is an integer number (158881903245).

Almost surely, 2^{1661564132342} is an apocalyptic number.

1661564132342 is a deficient number, since it is larger than the sum of its proper divisors (880546319578).

1661564132342 is a wasteful number, since it uses less digits than its factorization.

1661564132342 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41783935.

The product of its digits is 622080, while the sum is 44.

The spelling of 1661564132342 in words is "one trillion, six hundred sixty-one billion, five hundred sixty-four million, one hundred thirty-two thousand, three hundred forty-two".