646476674646 has 64 divisors (see below), whose sum is σ = 1448820608256. Its totient is φ = 190580457600.

The previous prime is 646476674633. The next prime is 646476674651.

646476674646 is nontrivially palindromic in base 10.

It is a super-2 number, since 2×646476674646² (a number of 24 digits) contains 22 as substring.

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 pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 23163076 + ... + 23190968.

It is an arithmetic number, because the mean of its divisors is an integer number (22637822004).

Almost surely, 2^646476674646 is an apocalyptic number.

646476674646 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

646476674646 is an abundant number, since it is smaller than the sum of its proper divisors (802343933610).

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

646476674646 is a wasteful number, since it uses less digits than its factorization.

646476674646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37437.

The product of its digits is 585252864, while the sum is 66.

The spelling of 646476674646 in words is "six hundred forty-six billion, four hundred seventy-six million, six hundred seventy-four thousand, six hundred forty-six".