228778181481 has 4 divisors (see below), whose sum is σ = 305037575312. Its totient is φ = 152518787652.

The previous prime is 228778181473. The next prime is 228778181483. The reversal of 228778181481 is 184181877822.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 228778181481 - 2³ = 228778181473 is a prime.

It is a super-2 number, since 2×228778181481² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (228778181483) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38129696911 + ... + 38129696916.

It is an arithmetic number, because the mean of its divisors is an integer number (76259393828).

Almost surely, 2^228778181481 is an apocalyptic number.

It is an amenable number.

228778181481 is a deficient number, since it is larger than the sum of its proper divisors (76259393831).

228778181481 is an equidigital number, since it uses as much as digits as its factorization.

228778181481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76259393830.

The product of its digits is 3211264, while the sum is 57.

The spelling of 228778181481 in words is "two hundred twenty-eight billion, seven hundred seventy-eight million, one hundred eighty-one thousand, four hundred eighty-one".