646155603220654 has 16 divisors (see below), whose sum is σ = 980126276218560. Its totient is φ = 319446863802880.

The previous prime is 646155603220613. The next prime is 646155603220691. The reversal of 646155603220654 is 456022306551646.

646155603220654 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 = 646155603220595 and 646155603220604.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 65075742 + ... + 74344894.

It is an arithmetic number, because the mean of its divisors is an integer number (61257892263660).

Almost surely, 2^{646155603220654} is an apocalyptic number.

646155603220654 is a deficient number, since it is larger than the sum of its proper divisors (333970672997906).

646155603220654 is a wasteful number, since it uses less digits than its factorization.

646155603220654 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9660875.

The product of its (nonzero) digits is 31104000, while the sum is 55.

The spelling of 646155603220654 in words is "six hundred forty-six trillion, one hundred fifty-five billion, six hundred three million, two hundred twenty thousand, six hundred fifty-four".