646543345646 has 16 divisors (see below), whose sum is σ = 1058897650608. Its totient is φ = 293628441600.

The previous prime is 646543345639. The next prime is 646543345663.

646543345646 is nontrivially palindromic in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 646543345591 and 646543345600.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12718925 + ... + 12769656.

It is an arithmetic number, because the mean of its divisors is an integer number (66181103163).

Almost surely, 2^646543345646 is an apocalyptic number.

646543345646 is a deficient number, since it is larger than the sum of its proper divisors (412354304962).

646543345646 is a wasteful number, since it uses less digits than its factorization.

646543345646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25489747.

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

The spelling of 646543345646 in words is "six hundred forty-six billion, five hundred forty-three million, three hundred forty-five thousand, six hundred forty-six".