1646521949448 has 64 divisors (see below), whose sum is σ = 4574325700800. Its totient is φ = 548762215680.

The previous prime is 1646521949431. The next prime is 1646521949507. The reversal of 1646521949448 is 8449491256461.

1646521949448 is a `hidden beast` number, since 1 + 6 + 46 + 52 + 19 + 494 + 48 = 666.

It is a super-3 number, since 3×1646521949448³ (a number of 38 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 980128 + ... + 2062448.

It is an arithmetic number, because the mean of its divisors is an integer number (71473839075).

Almost surely, 2^{1646521949448} is an apocalyptic number.

1646521949448 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1646521949448 is an abundant number, since it is smaller than the sum of its proper divisors (2927803751352).

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

1646521949448 is a wasteful number, since it uses less digits than its factorization.

1646521949448 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1089379 (or 1089369 counting only the distinct ones).

The product of its digits is 59719680, while the sum is 63.

The spelling of 1646521949448 in words is "one trillion, six hundred forty-six billion, five hundred twenty-one million, nine hundred forty-nine thousand, four hundred forty-eight".