111640252261 has 2 divisors, whose sum is σ = 111640252262. Its totient is φ = 111640252260.

The previous prime is 111640252177. The next prime is 111640252267. The reversal of 111640252261 is 162252046111.

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., 106777979361 + 4862272900 = 326769^2 + 69730^2 .

It is a cyclic number.

It is not a de Polignac number, because 111640252261 - 2⁷ = 111640252133 is a prime.

It is a super-3 number, since 3×111640252261³ (a number of 34 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111640252267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55820126130 + 55820126131.

It is an arithmetic number, because the mean of its divisors is an integer number (55820126131).

Almost surely, 2^111640252261 is an apocalyptic number.

It is an amenable number.

111640252261 is a deficient number, since it is larger than the sum of its proper divisors (1).

111640252261 is an equidigital number, since it uses as much as digits as its factorization.

111640252261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5760, while the sum is 31.

Adding to 111640252261 its reverse (162252046111), we get a palindrome (273892298372).

The spelling of 111640252261 in words is "one hundred eleven billion, six hundred forty million, two hundred fifty-two thousand, two hundred sixty-one".