11220627561 has 64 divisors (see below), whose sum is σ = 18036480000. Its totient is φ = 6113802240.

The previous prime is 11220627559. The next prime is 11220627577. The reversal of 11220627561 is 16572602211.

It is not a de Polignac number, because 11220627561 - 2¹ = 11220627559 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (11220627361) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 8983065 + ... + 8984313.

It is an arithmetic number, because the mean of its divisors is an integer number (281820000).

Almost surely, 2^11220627561 is an apocalyptic number.

11220627561 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

11220627561 is a deficient number, since it is larger than the sum of its proper divisors (6815852439).

11220627561 is a wasteful number, since it uses less digits than its factorization.

11220627561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1806.

The product of its (nonzero) digits is 10080, while the sum is 33.

The spelling of 11220627561 in words is "eleven billion, two hundred twenty million, six hundred twenty-seven thousand, five hundred sixty-one".