11563654861 has 4 divisors (see below), whose sum is σ = 12614896224. Its totient is φ = 10512413500.

The previous prime is 11563654859. The next prime is 11563654891. The reversal of 11563654861 is 16845636511.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 16845636511 = 11 ⋅1531421501.

It is a cyclic number.

It is not a de Polignac number, because 11563654861 - 2¹ = 11563654859 is a prime.

It is a super-2 number, since 2×11563654861² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11563654831) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 525620665 + ... + 525620686.

It is an arithmetic number, because the mean of its divisors is an integer number (3153724056).

Almost surely, 2^11563654861 is an apocalyptic number.

11563654861 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

11563654861 is a deficient number, since it is larger than the sum of its proper divisors (1051241363).

11563654861 is a wasteful number, since it uses less digits than its factorization.

11563654861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1051241362.

The product of its digits is 518400, while the sum is 46.

The spelling of 11563654861 in words is "eleven billion, five hundred sixty-three million, six hundred fifty-four thousand, eight hundred sixty-one".