646020456100 has 54 divisors (see below), whose sum is σ = 1489177809350. Its totient is φ = 243207690240.

The previous prime is 646020456071. The next prime is 646020456119. The reversal of 646020456100 is 1654020646.

It can be written as a sum of positive squares in 9 ways, for example, as 166189936896 + 479830519204 = 407664^2 + 692698^2 .

It is a Harshad number since it is a multiple of its sum of digits (34).

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 11147925 + ... + 11205724.

Almost surely, 2^646020456100 is an apocalyptic number.

It is an amenable number.

646020456100 is an abundant number, since it is smaller than the sum of its proper divisors (843157353250).

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

646020456100 is a wasteful number, since it uses less digits than its factorization.

646020456100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22353697 (or 22353673 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 34.

Adding to 646020456100 its reverse (1654020646), we get a palindrome (647674476746).

The spelling of 646020456100 in words is "six hundred forty-six billion, twenty million, four hundred fifty-six thousand, one hundred".