18951652225 has 27 divisors (see below), whose sum is σ = 25840956099. Its totient is φ = 13777513200.

The previous prime is 18951652211. The next prime is 18951652243. The reversal of 18951652225 is 52225615981.

The square root of 18951652225 is 137665.

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., 6822594801 + 12129057424 = 82599^2 + 110132^2 .

It is not a de Polignac number, because 18951652225 - 2⁵ = 18951652193 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 7570324 + ... + 7572826.

Almost surely, 2^18951652225 is an apocalyptic number.

18951652225 is the 137665-th square number.

18951652225 is the 68833-rd centered octagonal number.

It is an amenable number.

18951652225 is a deficient number, since it is larger than the sum of its proper divisors (6889303874).

18951652225 is an frugal number, since it uses more digits than its factorization.

18951652225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5038 (or 2519 counting only the distinct ones).

The product of its digits is 432000, while the sum is 46.

It can be divided in two parts, 18951 and 652225, that added together give a palindrome (671176).

The spelling of 18951652225 in words is "eighteen billion, nine hundred fifty-one million, six hundred fifty-two thousand, two hundred twenty-five".