643310523442 has 16 divisors (see below), whose sum is σ = 999628905600. Its totient is φ = 310131742480.

The previous prime is 643310523433. The next prime is 643310523461. The reversal of 643310523442 is 244325013346.

It is a super-3 number, since 3×643310523442³ (a number of 36 digits) contains 333 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7671484 + ... + 7754887.

It is an arithmetic number, because the mean of its divisors is an integer number (62476806600).

Almost surely, 2^643310523442 is an apocalyptic number.

643310523442 is a deficient number, since it is larger than the sum of its proper divisors (356318382158).

643310523442 is a wasteful number, since it uses less digits than its factorization.

643310523442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15427121.

The product of its (nonzero) digits is 207360, while the sum is 37.

Adding to 643310523442 its reverse (244325013346), we get a palindrome (887635536788).

The spelling of 643310523442 in words is "six hundred forty-three billion, three hundred ten million, five hundred twenty-three thousand, four hundred forty-two".