1618454674225 has 9 divisors (see below), whose sum is σ = 2006891683617. Its totient is φ = 1294758650640.

The previous prime is 1618454674223. The next prime is 1618454674229. The reversal of 1618454674225 is 5224764548161.

It is a happy number.

The square root of 1618454674225 is 1272185.

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

It can be written as a sum of positive squares in 4 ways, for example, as 608638703409 + 1009815970816 = 780153^2 + 1004896^2 .

It is not a de Polignac number, because 1618454674225 - 2¹ = 1618454674223 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1618454674223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 6233707 + ... + 6488143.

Almost surely, 2^{1618454674225} is an apocalyptic number.

1618454674225 is the 1272185-th square number.

1618454674225 is the 636093-rd centered octagonal number.

It is an amenable number.

1618454674225 is a deficient number, since it is larger than the sum of its proper divisors (388437009392).

1618454674225 is an frugal number, since it uses more digits than its factorization.

1618454674225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 508884 (or 254442 counting only the distinct ones).

The product of its digits is 12902400, while the sum is 55.

The spelling of 1618454674225 in words is "one trillion, six hundred eighteen billion, four hundred fifty-four million, six hundred seventy-four thousand, two hundred twenty-five".