5645211551561 has 8 divisors (see below), whose sum is σ = 5688414568704. Its totient is φ = 5602168250640.

The previous prime is 5645211551527. The next prime is 5645211551587. The reversal of 5645211551561 is 1651551125465.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-5645211551561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (5645211551521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39858095 + ... + 39999476.

It is an arithmetic number, because the mean of its divisors is an integer number (711051821088).

Almost surely, 2^{5645211551561} is an apocalyptic number.

It is an amenable number.

5645211551561 is a deficient number, since it is larger than the sum of its proper divisors (43203017143).

5645211551561 is a wasteful number, since it uses less digits than its factorization.

5645211551561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79858111.

The product of its digits is 900000, while the sum is 47.

The spelling of 5645211551561 in words is "five trillion, six hundred forty-five billion, two hundred eleven million, five hundred fifty-one thousand, five hundred sixty-one".