1646355816 has 48 divisors (see below), whose sum is σ = 5095864800. Its totient is φ = 470387232.

The previous prime is 1646355793. The next prime is 1646355817. The reversal of 1646355816 is 6185536461.

1646355816 is a `hidden beast` number, since 1 + 6 + 4 + 63 + 5 + 581 + 6 = 666.

It is not an unprimeable number, because it can be changed into a prime (1646355817) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1632786 + ... + 1633793.

It is an arithmetic number, because the mean of its divisors is an integer number (106163850).

Almost surely, 2^1646355816 is an apocalyptic number.

It is an amenable number.

1646355816 is an abundant number, since it is smaller than the sum of its proper divisors (3449508984).

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

1646355816 is a wasteful number, since it uses less digits than its factorization.

1646355816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3266598 (or 3266591 counting only the distinct ones).

The product of its digits is 518400, while the sum is 45.

The square root of 1646355816 is about 40575.3104239512. The cubic root of 1646355816 is about 1180.7951683379.

The spelling of 1646355816 in words is "one billion, six hundred forty-six million, three hundred fifty-five thousand, eight hundred sixteen".