225005743778 has 4 divisors (see below), whose sum is σ = 337508615670. Its totient is φ = 112502871888.

The previous prime is 225005743777. The next prime is 225005743801. The reversal of 225005743778 is 877347500522.

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

It can be written as a sum of positive squares in only one way, i.e., 199079269489 + 25926474289 = 446183^2 + 161017^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (225005743777) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 56251435943 + ... + 56251435946.

Almost surely, 2^225005743778 is an apocalyptic number.

225005743778 is a deficient number, since it is larger than the sum of its proper divisors (112502871892).

225005743778 is a wasteful number, since it uses less digits than its factorization.

225005743778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112502871891.

The product of its (nonzero) digits is 3292800, while the sum is 50.

The spelling of 225005743778 in words is "two hundred twenty-five billion, five million, seven hundred forty-three thousand, seven hundred seventy-eight".