1661151565622 has 8 divisors (see below), whose sum is σ = 2600063320176. Its totient is φ = 794463792232.

The previous prime is 1661151565607. The next prime is 1661151565631. The reversal of 1661151565622 is 2265651511661.

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

It is a congruent number.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 18055995233 + ... + 18055995324.

It is an arithmetic number, because the mean of its divisors is an integer number (325007915022).

Almost surely, 2^{1661151565622} is an apocalyptic number.

1661151565622 is a deficient number, since it is larger than the sum of its proper divisors (938911754554).

1661151565622 is a wasteful number, since it uses less digits than its factorization.

1661151565622 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36111990582.

The product of its digits is 648000, while the sum is 47.

The spelling of 1661151565622 in words is "one trillion, six hundred sixty-one billion, one hundred fifty-one million, five hundred sixty-five thousand, six hundred twenty-two".