661367544241 has 16 divisors (see below), whose sum is σ = 707586119680. Its totient is φ = 617021634240.

The previous prime is 661367544217. The next prime is 661367544263. The reversal of 661367544241 is 142445763166.

It is a cyclic number.

It is not a de Polignac number, because 661367544241 - 2¹⁵ = 661367511473 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (661367544041) 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 15 ways as a sum of consecutive naturals, for example, 2519961 + ... + 2770006.

It is an arithmetic number, because the mean of its divisors is an integer number (44224132480).

Almost surely, 2^661367544241 is an apocalyptic number.

It is an amenable number.

661367544241 is a deficient number, since it is larger than the sum of its proper divisors (46218575439).

661367544241 is a wasteful number, since it uses less digits than its factorization.

661367544241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5290144.

The product of its digits is 2903040, while the sum is 49.

The spelling of 661367544241 in words is "six hundred sixty-one billion, three hundred sixty-seven million, five hundred forty-four thousand, two hundred forty-one".