541543055561 has 4 divisors (see below), whose sum is σ = 541554401412. Its totient is φ = 541531709712.

The previous prime is 541543055551. The next prime is 541543055587. The reversal of 541543055561 is 165550345145.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 417529207225 + 124013848336 = 646165^2 + 352156^2 .

It is a cyclic number.

It is not a de Polignac number, because 541543055561 - 2¹⁸ = 541542793417 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (541543055551) 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, 5601026 + ... + 5696891.

It is an arithmetic number, because the mean of its divisors is an integer number (135388600353).

Almost surely, 2^541543055561 is an apocalyptic number.

It is an amenable number.

541543055561 is a deficient number, since it is larger than the sum of its proper divisors (11345851).

541543055561 is a wasteful number, since it uses less digits than its factorization.

541543055561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11345850.

The product of its (nonzero) digits is 900000, while the sum is 44.

The spelling of 541543055561 in words is "five hundred forty-one billion, five hundred forty-three million, fifty-five thousand, five hundred sixty-one".