6643958593402 has 24 divisors (see below), whose sum is σ = 10792129301280. Its totient is φ = 3066268879440.

The previous prime is 6643958593379. The next prime is 6643958593403. The reversal of 6643958593402 is 2043958593466.

It is a Smith number, since the sum of its digits (64) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (6643958593403) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5522877 + ... + 6617407.

It is an arithmetic number, because the mean of its divisors is an integer number (449672054220).

Almost surely, 2^{6643958593402} is an apocalyptic number.

6643958593402 is a deficient number, since it is larger than the sum of its proper divisors (4148170707878).

6643958593402 is a wasteful number, since it uses less digits than its factorization.

6643958593402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1112518 (or 1112505 counting only the distinct ones).

The product of its (nonzero) digits is 167961600, while the sum is 64.

Adding to 6643958593402 its sum of digits (64), we get a palindrome (6643958593466).

The spelling of 6643958593402 in words is "six trillion, six hundred forty-three billion, nine hundred fifty-eight million, five hundred ninety-three thousand, four hundred two".