243695259025 has 9 divisors (see below), whose sum is σ = 302185181883. Its totient is φ = 194954232600.

The previous prime is 243695259013. The next prime is 243695259037. The reversal of 243695259025 is 520952596342.

It is a happy number.

The square root of 243695259025 is 493655.

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

It is an interprime number because it is at equal distance from previous prime (243695259013) and next prime (243695259037).

It can be written as a sum of positive squares in only one way, i.e., 87730293249 + 155964965776 = 296193^2 + 394924^2 .

It is not a de Polignac number, because 243695259025 - 2²³ = 243686870417 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 2418910 + ... + 2517640.

Almost surely, 2^243695259025 is an apocalyptic number.

243695259025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

243695259025 is the 493655-th square number.

243695259025 is the 246828-th centered octagonal number.

It is an amenable number.

243695259025 is a deficient number, since it is larger than the sum of its proper divisors (58489922858).

243695259025 is an frugal number, since it uses more digits than its factorization.

243695259025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 197472 (or 98736 counting only the distinct ones).

The product of its (nonzero) digits is 5832000, while the sum is 52.

The spelling of 243695259025 in words is "two hundred forty-three billion, six hundred ninety-five million, two hundred fifty-nine thousand, twenty-five".