646436623732 has 12 divisors (see below), whose sum is σ = 1131283387780. Its totient is φ = 323212798656.

The previous prime is 646436623673. The next prime is 646436623753. The reversal of 646436623732 is 237326634646.

It can be written as a sum of positive squares in 2 ways, for example, as 263072564836 + 383364058896 = 512906^2 + 619164^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 646436623732.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1108623 + ... + 1588054.

Almost surely, 2^646436623732 is an apocalyptic number.

It is an amenable number.

646436623732 is a deficient number, since it is larger than the sum of its proper divisors (484846764048).

646436623732 is a wasteful number, since it uses less digits than its factorization.

646436623732 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2756610 (or 2756608 counting only the distinct ones).

The product of its digits is 15676416, while the sum is 52.

The spelling of 646436623732 in words is "six hundred forty-six billion, four hundred thirty-six million, six hundred twenty-three thousand, seven hundred thirty-two".