643242266025 has 24 divisors (see below), whose sum is σ = 1064692968384. Its totient is φ = 342675739200.

The previous prime is 643242266011. The next prime is 643242266039. The reversal of 643242266025 is 520662242346.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (643242266011) and next prime (643242266039).

It is not a de Polignac number, because 643242266025 - 2⁵ = 643242265993 is a prime.

It is a super-2 number, since 2×643242266025² (a number of 24 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4768066 + ... + 4901115.

It is an arithmetic number, because the mean of its divisors is an integer number (44362207016).

Almost surely, 2^643242266025 is an apocalyptic number.

It is an amenable number.

643242266025 is a deficient number, since it is larger than the sum of its proper divisors (421450702359).

643242266025 is a wasteful number, since it uses less digits than its factorization.

643242266025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9670081 (or 9670076 counting only the distinct ones).

The product of its (nonzero) digits is 829440, while the sum is 42.

The spelling of 643242266025 in words is "six hundred forty-three billion, two hundred forty-two million, two hundred sixty-six thousand, twenty-five".