11561415666545 has 8 divisors (see below), whose sum is σ = 14011062154920. Its totient is φ = 9157556963200.

The previous prime is 11561415666523. The next prime is 11561415666589. The reversal of 11561415666545 is 54566651416511.

It is a happy number.

11561415666545 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 3528176182336 + 8033239484209 = 1878344^2 + 2834297^2 .

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

It is not a de Polignac number, because 11561415666545 - 2⁶ = 11561415666481 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11446945700 + ... + 11446946709.

It is an arithmetic number, because the mean of its divisors is an integer number (1751382769365).

Almost surely, 2^{11561415666545} is an apocalyptic number.

It is an amenable number.

11561415666545 is a deficient number, since it is larger than the sum of its proper divisors (2449646488375).

11561415666545 is a wasteful number, since it uses less digits than its factorization.

11561415666545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22893892515.

The product of its digits is 12960000, while the sum is 56.

The spelling of 11561415666545 in words is "eleven trillion, five hundred sixty-one billion, four hundred fifteen million, six hundred sixty-six thousand, five hundred forty-five".