11123699861 has 2 divisors, whose sum is σ = 11123699862. Its totient is φ = 11123699860.

The previous prime is 11123699843. The next prime is 11123699959. The reversal of 11123699861 is 16899632111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10317480625 + 806219236 = 101575^2 + 28394^2 .

It is a cyclic number.

It is not a de Polignac number, because 11123699861 - 2¹⁰ = 11123698837 is a prime.

It is a super-2 number, since 2×11123699861² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11123699261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5561849930 + 5561849931.

It is an arithmetic number, because the mean of its divisors is an integer number (5561849931).

Almost surely, 2^11123699861 is an apocalyptic number.

It is an amenable number.

11123699861 is a deficient number, since it is larger than the sum of its proper divisors (1).

11123699861 is an equidigital number, since it uses as much as digits as its factorization.

11123699861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 139968, while the sum is 47.

The spelling of 11123699861 in words is "eleven billion, one hundred twenty-three million, six hundred ninety-nine thousand, eight hundred sixty-one".