646926629646 has 64 divisors (see below), whose sum is σ = 1445686767360. Its totient is φ = 191340610560.

The previous prime is 646926629627. The next prime is 646926629653.

646926629646 is nontrivially palindromic in base 10.

It is a Harshad number since it is a multiple of its sum of digits (66).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 189091 + ... + 1153086.

It is an arithmetic number, because the mean of its divisors is an integer number (22588855740).

Almost surely, 2^646926629646 is an apocalyptic number.

646926629646 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

646926629646 is an abundant number, since it is smaller than the sum of its proper divisors (798760137714).

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

646926629646 is a wasteful number, since it uses less digits than its factorization.

646926629646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1342369.

The product of its digits is 241864704, while the sum is 66.

The spelling of 646926629646 in words is "six hundred forty-six billion, nine hundred twenty-six million, six hundred twenty-nine thousand, six hundred forty-six".