1646664951960 has 192 divisors, whose sum is σ = 6151539401280. Its totient is φ = 374204851200.

The previous prime is 1646664951941. The next prime is 1646664951983. The reversal of 1646664951960 is 691594666461.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1452591 + ... + 2324510.

It is an arithmetic number, because the mean of its divisors is an integer number (32039267715).

Almost surely, 2^{1646664951960} is an apocalyptic number.

1646664951960 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1646664951960 is an abundant number, since it is smaller than the sum of its proper divisors (4504874449320).

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

1646664951960 is a wasteful number, since it uses less digits than its factorization.

1646664951960 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3777298 (or 3777291 counting only the distinct ones).

The product of its (nonzero) digits is 50388480, while the sum is 63.

The spelling of 1646664951960 in words is "one trillion, six hundred forty-six billion, six hundred sixty-four million, nine hundred fifty-one thousand, nine hundred sixty".