229661378549 has 4 divisors (see below), whose sum is σ = 237580736460. Its totient is φ = 221742020640.

The previous prime is 229661378533. The next prime is 229661378581. The reversal of 229661378549 is 945873166922.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 113042543524 + 116618835025 = 336218^2 + 341495^2 .

It is a cyclic number.

It is not a de Polignac number, because 229661378549 - 2⁴ = 229661378533 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 229661378491 and 229661378500.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (229661348549) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3959678912 + ... + 3959678969.

It is an arithmetic number, because the mean of its divisors is an integer number (59395184115).

Almost surely, 2^229661378549 is an apocalyptic number.

229661378549 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

229661378549 is a deficient number, since it is larger than the sum of its proper divisors (7919357911).

229661378549 is an equidigital number, since it uses as much as digits as its factorization.

229661378549 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7919357910.

The product of its digits is 39191040, while the sum is 62.

The spelling of 229661378549 in words is "two hundred twenty-nine billion, six hundred sixty-one million, three hundred seventy-eight thousand, five hundred forty-nine".