643630760042 has 16 divisors (see below), whose sum is σ = 1005408951552. Its totient is φ = 308678180160.

The previous prime is 643630760033. The next prime is 643630760177. The reversal of 643630760042 is 240067036346.

It is a super-3 number, since 3×643630760042³ (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, 45927248 + ... + 45941259.

It is an arithmetic number, because the mean of its divisors is an integer number (62838059472).

Almost surely, 2^643630760042 is an apocalyptic number.

643630760042 is a gapful number since it is divisible by the number (62) formed by its first and last digit.

643630760042 is a deficient number, since it is larger than the sum of its proper divisors (361778191510).

643630760042 is a wasteful number, since it uses less digits than its factorization.

643630760042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91868653.

The product of its (nonzero) digits is 435456, while the sum is 41.

Adding to 643630760042 its reverse (240067036346), we get a palindrome (883697796388).

The spelling of 643630760042 in words is "six hundred forty-three billion, six hundred thirty million, seven hundred sixty thousand, forty-two".