643462426402 has 16 divisors (see below), whose sum is σ = 988758103032. Its totient is φ = 313876759680.

The previous prime is 643462426379. The next prime is 643462426403. The reversal of 643462426402 is 204624264346.

It is a happy number.

643462426402 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 254297309841 + 389165116561 = 504279^2 + 623831^2 .

It is a super-2 number, since 2×643462426402² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (643462426403) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5474968 + ... + 5591260.

Almost surely, 2^643462426402 is an apocalyptic number.

643462426402 is a deficient number, since it is larger than the sum of its proper divisors (345295676630).

643462426402 is a wasteful number, since it uses less digits than its factorization.

643462426402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 183813.

The product of its (nonzero) digits is 1327104, while the sum is 43.

The spelling of 643462426402 in words is "six hundred forty-three billion, four hundred sixty-two million, four hundred twenty-six thousand, four hundred two".