643653534213402 has 32 divisors (see below), whose sum is σ = 1288191015944640. Its totient is φ = 214403858336640.

The previous prime is 643653534213401. The next prime is 643653534213461. The reversal of 643653534213402 is 204312435356346.

It is not an unprimeable number, because it can be changed into a prime (643653534213401) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 559649902 + ... + 560798822.

It is an arithmetic number, because the mean of its divisors is an integer number (40255969248270).

Almost surely, 2^{643653534213402} is an apocalyptic number.

643653534213402 is an abundant number, since it is smaller than the sum of its proper divisors (644537481731238).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

643653534213402 is a wasteful number, since it uses less digits than its factorization.

643653534213402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1212958.

The product of its (nonzero) digits is 18662400, while the sum is 51.

Adding to 643653534213402 its reverse (204312435356346), we get a palindrome (847965969569748).

The spelling of 643653534213402 in words is "six hundred forty-three trillion, six hundred fifty-three billion, five hundred thirty-four million, two hundred thirteen thousand, four hundred two".