1646864420355 has 576 divisors, whose sum is σ = 3836795848704. Its totient is φ = 638303846400.

The previous prime is 1646864420297. The next prime is 1646864420419. The reversal of 1646864420355 is 5530244686461.

1646864420355 is a `hidden beast` number, since 164 + 6 + 8 + 6 + 4 + 420 + 3 + 55 = 666.

It is not a de Polignac number, because 1646864420355 - 2¹⁰ = 1646864419331 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 575 ways as a sum of consecutive naturals, for example, 9098698365 + ... + 9098698545.

It is an arithmetic number, because the mean of its divisors is an integer number (6661103904).

Almost surely, 2^{1646864420355} is an apocalyptic number.

1646864420355 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1646864420355 is an abundant number, since it is smaller than the sum of its proper divisors (2189931428349).

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

1646864420355 is a wasteful number, since it uses less digits than its factorization.

1646864420355 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 448 (or 434 counting only the distinct ones).

The product of its (nonzero) digits is 16588800, while the sum is 54.

The spelling of 1646864420355 in words is "one trillion, six hundred forty-six billion, eight hundred sixty-four million, four hundred twenty thousand, three hundred fifty-five".