11109778957 has 2 divisors, whose sum is σ = 11109778958. Its totient is φ = 11109778956.

The previous prime is 11109778943. The next prime is 11109778993. The reversal of 11109778957 is 75987790111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9676853641 + 1432925316 = 98371^2 + 37854^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11109778957 is a prime.

It is a super-3 number, since 3×11109778957³ (a number of 31 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 11109778898 and 11109778907.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11109779957) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5554889478 + 5554889479.

It is an arithmetic number, because the mean of its divisors is an integer number (5554889479).

Almost surely, 2^11109778957 is an apocalyptic number.

It is an amenable number.

11109778957 is a deficient number, since it is larger than the sum of its proper divisors (1).

11109778957 is an equidigital number, since it uses as much as digits as its factorization.

11109778957 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1111320, while the sum is 55.

The spelling of 11109778957 in words is "eleven billion, one hundred nine million, seven hundred seventy-eight thousand, nine hundred fifty-seven".