11137765561 has 16 divisors (see below), whose sum is σ = 12140069760. Its totient is φ = 10156849920.

The previous prime is 11137765559. The next prime is 11137765603. The reversal of 11137765561 is 16556773111.

It is a cyclic number.

It is not a de Polignac number, because 11137765561 - 2¹ = 11137765559 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11137765531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 444670 + ... + 469048.

It is an arithmetic number, because the mean of its divisors is an integer number (758754360).

Almost surely, 2^11137765561 is an apocalyptic number.

It is an amenable number.

11137765561 is a deficient number, since it is larger than the sum of its proper divisors (1002304199).

11137765561 is a wasteful number, since it uses less digits than its factorization.

11137765561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24816.

The product of its digits is 132300, while the sum is 43.

The spelling of 11137765561 in words is "eleven billion, one hundred thirty-seven million, seven hundred sixty-five thousand, five hundred sixty-one".