661552363621341 has 64 divisors (see below), whose sum is σ = 990515766240000. Its totient is φ = 436358205803520.

The previous prime is 661552363621339. The next prime is 661552363621411. The reversal of 661552363621341 is 143126363255166.

661552363621341 is a `hidden beast` number, since 6 + 6 + 1 + 5 + 5 + 2 + 3 + 6 + 3 + 621 + 3 + 4 + 1 = 666.

It is not a de Polignac number, because 661552363621341 - 2¹ = 661552363621339 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661552363621301) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 11071420321 + ... + 11071480073.

It is an arithmetic number, because the mean of its divisors is an integer number (15476808847500).

Almost surely, 2^{661552363621341} is an apocalyptic number.

It is an amenable number.

661552363621341 is a deficient number, since it is larger than the sum of its proper divisors (328963402618659).

661552363621341 is a wasteful number, since it uses less digits than its factorization.

661552363621341 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69211 (or 69205 counting only the distinct ones).

The product of its digits is 13996800, while the sum is 54.

The spelling of 661552363621341 in words is "six hundred sixty-one trillion, five hundred fifty-two billion, three hundred sixty-three million, six hundred twenty-one thousand, three hundred forty-one".