238158640225 has 81 divisors (see below), whose sum is σ = 343323104691. Its totient is φ = 163738792800.

The previous prime is 238158640207. The next prime is 238158640229. The reversal of 238158640225 is 522046851832.

The square root of 238158640225 is 488015.

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., 85737110481 + 152421529744 = 292809^2 + 390412^2 .

It is not a de Polignac number, because 238158640225 - 2¹⁵ = 238158607457 is a prime.

It is not an unprimeable number, because it can be changed into a prime (238158640229) by changing a digit.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 509975442 + ... + 509975908.

Almost surely, 2^238158640225 is an apocalyptic number.

238158640225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

238158640225 is the 488015-th square number.

238158640225 is the 244008-th centered octagonal number.

It is an amenable number.

238158640225 is a deficient number, since it is larger than the sum of its proper divisors (105164464466).

238158640225 is an equidigital number, since it uses as much as digits as its factorization.

238158640225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1004 (or 502 counting only the distinct ones).

The product of its (nonzero) digits is 921600, while the sum is 46.

The spelling of 238158640225 in words is "two hundred thirty-eight billion, one hundred fifty-eight million, six hundred forty thousand, two hundred twenty-five".