11111611649 has 2 divisors, whose sum is σ = 11111611650. Its totient is φ = 11111611648.

The previous prime is 11111611613. The next prime is 11111611663. The reversal of 11111611649 is 94611611111.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6811531024 + 4300080625 = 82532^2 + 65575^2 .

It is a cyclic number.

It is not a de Polignac number, because 11111611649 - 2¹⁶ = 11111546113 is a prime.

It is not a weakly prime, because it can be changed into another prime (11111611669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5555805824 + 5555805825.

It is an arithmetic number, because the mean of its divisors is an integer number (5555805825).

Almost surely, 2^11111611649 is an apocalyptic number.

It is an amenable number.

11111611649 is a deficient number, since it is larger than the sum of its proper divisors (1).

11111611649 is an equidigital number, since it uses as much as digits as its factorization.

11111611649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1296, while the sum is 32.

The spelling of 11111611649 in words is "eleven billion, one hundred eleven million, six hundred eleven thousand, six hundred forty-nine".