643860263486 has 16 divisors (see below), whose sum is σ = 1057185401328. Its totient is φ = 291664900800.

The previous prime is 643860263483. The next prime is 643860263503. The reversal of 643860263486 is 684362068346.

It is a happy number.

It is a super-2 number, since 2×643860263486² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643860263483) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49936175 + ... + 49949066.

It is an arithmetic number, because the mean of its divisors is an integer number (66074087583).

Almost surely, 2^643860263486 is an apocalyptic number.

643860263486 is a deficient number, since it is larger than the sum of its proper divisors (413325137842).

643860263486 is a wasteful number, since it uses less digits than its factorization.

643860263486 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99885547.

The product of its (nonzero) digits is 23887872, while the sum is 56.

The spelling of 643860263486 in words is "six hundred forty-three billion, eight hundred sixty million, two hundred sixty-three thousand, four hundred eighty-six".