643698896346 has 48 divisors (see below), whose sum is σ = 1521983960640. Its totient is φ = 194994394560.

The previous prime is 643698896327. The next prime is 643698896389.

643698896346 is a `hidden beast` number, since 6 + 436 + 98 + 8 + 9 + 63 + 46 = 666.

643698896346 is nontrivially palindromic in base 10.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 40371 + ... + 1135353.

It is an arithmetic number, because the mean of its divisors is an integer number (31707999180).

Almost surely, 2^643698896346 is an apocalyptic number.

643698896346 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

643698896346 is an abundant number, since it is smaller than the sum of its proper divisors (878285064294).

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

643698896346 is a wasteful number, since it uses less digits than its factorization.

643698896346 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1097971 (or 1097968 counting only the distinct ones).

The product of its digits is 967458816, while the sum is 72.

The spelling of 643698896346 in words is "six hundred forty-three billion, six hundred ninety-eight million, eight hundred ninety-six thousand, three hundred forty-six".