643456654346 has 32 divisors (see below), whose sum is σ = 1055886829632. Its totient is φ = 291659132160.

The previous prime is 643456654343. The next prime is 643456654369.

643456654346 is nontrivially palindromic in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 643456654291 and 643456654300.

It is not an unprimeable number, because it can be changed into a prime (643456654343) 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, 37870865 + ... + 37887851.

It is an arithmetic number, because the mean of its divisors is an integer number (32996463426).

Almost surely, 2^643456654346 is an apocalyptic number.

643456654346 is a deficient number, since it is larger than the sum of its proper divisors (412430175286).

643456654346 is a wasteful number, since it uses less digits than its factorization.

643456654346 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21734.

The product of its digits is 74649600, while the sum is 56.

The spelling of 643456654346 in words is "six hundred forty-three billion, four hundred fifty-six million, six hundred fifty-four thousand, three hundred forty-six".