13228148777 has 4 divisors (see below), whose sum is σ = 13239622740. Its totient is φ = 13216674816.

The previous prime is 13228148761. The next prime is 13228148807. The reversal of 13228148777 is 77784182231.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 77784182231 = 7 ⋅11112026033.

It can be written as a sum of positive squares in 2 ways, for example, as 11297776681 + 1930372096 = 106291^2 + 43936^2 .

It is a cyclic number.

It is not a de Polignac number, because 13228148777 - 2⁴ = 13228148761 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13228148077) 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, 5735252 + ... + 5737557.

It is an arithmetic number, because the mean of its divisors is an integer number (3309905685).

Almost surely, 2^13228148777 is an apocalyptic number.

It is an amenable number.

13228148777 is a deficient number, since it is larger than the sum of its proper divisors (11473963).

13228148777 is a wasteful number, since it uses less digits than its factorization.

13228148777 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11473962.

The product of its digits is 1053696, while the sum is 50.

The spelling of 13228148777 in words is "thirteen billion, two hundred twenty-eight million, one hundred forty-eight thousand, seven hundred seventy-seven".