561666151547 has 4 divisors (see below), whose sum is σ = 565765904616. Its totient is φ = 557566398480.

The previous prime is 561666151523. The next prime is 561666151591. The reversal of 561666151547 is 745151666165.

561666151547 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 745151666165 = 5 ⋅149030333233.

It is a cyclic number.

It is not a de Polignac number, because 561666151547 - 2²⁸ = 561397716091 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (561666151147) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2049876329 + ... + 2049876602.

It is an arithmetic number, because the mean of its divisors is an integer number (141441476154).

Almost surely, 2^561666151547 is an apocalyptic number.

561666151547 is a deficient number, since it is larger than the sum of its proper divisors (4099753069).

561666151547 is a wasteful number, since it uses less digits than its factorization.

561666151547 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4099753068.

The product of its digits is 4536000, while the sum is 53.

The spelling of 561666151547 in words is "five hundred sixty-one billion, six hundred sixty-six million, one hundred fifty-one thousand, five hundred forty-seven".