11345378549 has 2 divisors, whose sum is σ = 11345378550. Its totient is φ = 11345378548.

The previous prime is 11345378531. The next prime is 11345378557. The reversal of 11345378549 is 94587354311.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11319470449 + 25908100 = 106393^2 + 5090^2 .

It is an emirp because it is prime and its reverse (94587354311) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11345378549 - 2³² = 7050411253 is a prime.

It is a super-2 number, since 2×11345378549² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 11345378497 and 11345378506.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11345378599) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5672689274 + 5672689275.

It is an arithmetic number, because the mean of its divisors is an integer number (5672689275).

Almost surely, 2^11345378549 is an apocalyptic number.

It is an amenable number.

11345378549 is a deficient number, since it is larger than the sum of its proper divisors (1).

11345378549 is an equidigital number, since it uses as much as digits as its factorization.

11345378549 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1814400, while the sum is 50.

The spelling of 11345378549 in words is "eleven billion, three hundred forty-five million, three hundred seventy-eight thousand, five hundred forty-nine".