243425665 has 16 divisors (see below), whose sum is σ = 335237760. Its totient is φ = 166222080.

The previous prime is 243425657. The next prime is 243425717. The reversal of 243425665 is 566524342.

It is not a de Polignac number, because 243425665 - 2³ = 243425657 is a prime.

It is a super-3 number, since 3×243425665³ (a number of 26 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5995 + ... + 22864.

It is an arithmetic number, because the mean of its divisors is an integer number (20952360).

Almost surely, 2^243425665 is an apocalyptic number.

It is an amenable number.

243425665 is a deficient number, since it is larger than the sum of its proper divisors (91812095).

243425665 is a wasteful number, since it uses less digits than its factorization.

243425665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29112.

The product of its digits is 172800, while the sum is 37.

The square root of 243425665 is about 15602.1045054826. The cubic root of 243425665 is about 624.3893042755.

It can be divided in two parts, 2434256 and 65, that added together give a triangular number (2434321 = T₂₂₀₆).

The spelling of 243425665 in words is "two hundred forty-three million, four hundred twenty-five thousand, six hundred sixty-five".