646641544 has 16 divisors (see below), whose sum is σ = 1227801600. Its totient is φ = 319227792.

The previous prime is 646641539. The next prime is 646641559. The reversal of 646641544 is 445146646.

646641544 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 646641497 and 646641506.

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, 510952 + ... + 512215.

It is an arithmetic number, because the mean of its divisors is an integer number (76737600).

Almost surely, 2^646641544 is an apocalyptic number.

It is an amenable number.

646641544 is a deficient number, since it is larger than the sum of its proper divisors (581160056).

646641544 is a wasteful number, since it uses less digits than its factorization.

646641544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1023252 (or 1023248 counting only the distinct ones).

The product of its digits is 276480, while the sum is 40.

The square root of 646641544 is about 25429.1475279845. The cubic root of 646641544 is about 864.7446177155.

The spelling of 646641544 in words is "six hundred forty-six million, six hundred forty-one thousand, five hundred forty-four".