536561505561 has 16 divisors (see below), whose sum is σ = 724400712000. Its totient is φ = 353231413248.

The previous prime is 536561505559. The next prime is 536561505587. The reversal of 536561505561 is 165505165635.

It is not a de Polignac number, because 536561505561 - 2¹ = 536561505559 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 536561505561.

It is not an unprimeable number, because it can be changed into a prime (536561505511) 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, 1922631 + ... + 2183948.

It is an arithmetic number, because the mean of its divisors is an integer number (45275044500).

Almost surely, 2^536561505561 is an apocalyptic number.

It is an amenable number.

536561505561 is a deficient number, since it is larger than the sum of its proper divisors (187839206439).

536561505561 is a wasteful number, since it uses less digits than its factorization.

536561505561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4107128.

The product of its (nonzero) digits is 2025000, while the sum is 48.

The spelling of 536561505561 in words is "five hundred thirty-six billion, five hundred sixty-one million, five hundred five thousand, five hundred sixty-one".