11001561161601 has 32 divisors (see below), whose sum is σ = 14729281251840. Its totient is φ = 7304187744000.

The previous prime is 11001561161597. The next prime is 11001561161621. The reversal of 11001561161601 is 10616116510011.

It is not a de Polignac number, because 11001561161601 - 2² = 11001561161597 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11001561161621) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1562052586 + ... + 1562059628.

It is an arithmetic number, because the mean of its divisors is an integer number (460290039120).

Almost surely, 2^{11001561161601} is an apocalyptic number.

It is an amenable number.

11001561161601 is a deficient number, since it is larger than the sum of its proper divisors (3727720090239).

11001561161601 is a wasteful number, since it uses less digits than its factorization.

11001561161601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9597.

The product of its (nonzero) digits is 1080, while the sum is 30.

Adding to 11001561161601 its reverse (10616116510011), we get a palindrome (21617677671612).

The spelling of 11001561161601 in words is "eleven trillion, one billion, five hundred sixty-one million, one hundred sixty-one thousand, six hundred one".