22378718278225 has 9 divisors (see below), whose sum is σ = 27749639994843. Its totient is φ = 17902955700120.

The previous prime is 22378718278223. The next prime is 22378718278291. The reversal of 22378718278225 is 52287281787322.

The square root of 22378718278225 is 4730615.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 8056338580161 + 14322379698064 = 2838369^2 + 3784492^2 .

It is not a de Polignac number, because 22378718278225 - 2¹ = 22378718278223 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22378718278223) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 23180014 + ... + 24126136.

Almost surely, 2^{22378718278225} is an apocalyptic number.

22378718278225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

22378718278225 is the 4730615-th square number.

22378718278225 is the 2365308-th centered octagonal number.

It is an amenable number.

22378718278225 is a deficient number, since it is larger than the sum of its proper divisors (5370921716618).

22378718278225 is an frugal number, since it uses more digits than its factorization.

22378718278225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1892256 (or 946128 counting only the distinct ones).

The product of its digits is 84295680, while the sum is 64.

The spelling of 22378718278225 in words is "twenty-two trillion, three hundred seventy-eight billion, seven hundred eighteen million, two hundred seventy-eight thousand, two hundred twenty-five".