225299021378 has 6 divisors (see below), whose sum is σ = 337949538969. Its totient is φ = 112649175056.

The previous prime is 225299021347. The next prime is 225299021401. The reversal of 225299021378 is 873120992522.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 152281794289 + 73017227089 = 390233^2 + 270217^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=335633.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 503450 + ... + 839082.

Almost surely, 2^225299021378 is an apocalyptic number.

225299021378 is a deficient number, since it is larger than the sum of its proper divisors (112650517591).

225299021378 is an frugal number, since it uses more digits than its factorization.

225299021378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 671268 (or 335635 counting only the distinct ones).

The product of its (nonzero) digits is 1088640, while the sum is 50.

Multiplying 225299021378 by its sum of digits (50), we get a square (11264951068900 = 3356330²).

The spelling of 225299021378 in words is "two hundred twenty-five billion, two hundred ninety-nine million, twenty-one thousand, three hundred seventy-eight".