643630214300026 has 16 divisors (see below), whose sum is σ = 1049864228733096. Its totient is φ = 294698730871296.

The previous prime is 643630214299997. The next prime is 643630214300027. The reversal of 643630214300026 is 620003412036346.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 611187222284401 + 32442992015625 = 24722201^2 + 5695875^2 .

It is a super-2 number, since 2×643630214300026² (a number of 30 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (643630214300027) 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, 255814869291 + ... + 255814871806.

Almost surely, 2^{643630214300026} is an apocalyptic number.

643630214300026 is a deficient number, since it is larger than the sum of its proper divisors (406234014433070).

643630214300026 is a wasteful number, since it uses less digits than its factorization.

643630214300026 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 511629741153.

The product of its (nonzero) digits is 373248, while the sum is 40.

The spelling of 643630214300026 in words is "six hundred forty-three trillion, six hundred thirty billion, two hundred fourteen million, three hundred thousand, twenty-six".