11125207661 has 2 divisors, whose sum is σ = 11125207662. Its totient is φ = 11125207660.

The previous prime is 11125207631. The next prime is 11125207669. The reversal of 11125207661 is 16670252111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7023445636 + 4101762025 = 83806^2 + 64045^2 .

It is a cyclic number.

It is not a de Polignac number, because 11125207661 - 2²² = 11121013357 is a prime.

It is a super-3 number, since 3×11125207661³ (a number of 31 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11125207669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5562603830 + 5562603831.

It is an arithmetic number, because the mean of its divisors is an integer number (5562603831).

Almost surely, 2^11125207661 is an apocalyptic number.

It is an amenable number.

11125207661 is a deficient number, since it is larger than the sum of its proper divisors (1).

11125207661 is an equidigital number, since it uses as much as digits as its factorization.

11125207661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5040, while the sum is 32.

Adding to 11125207661 its reverse (16670252111), we get a palindrome (27795459772).

The spelling of 11125207661 in words is "eleven billion, one hundred twenty-five million, two hundred seven thousand, six hundred sixty-one".