1645955712 has 192 divisors, whose sum is σ = 5030844000. Its totient is φ = 515082240.

The previous prime is 1645955683. The next prime is 1645955713. The reversal of 1645955712 is 2175595461.

It is a happy number.

1645955712 is a `hidden beast` number, since 1 + 6 + 4 + 595 + 57 + 1 + 2 = 666.

It is a tau number, because it is divible by the number of its divisors (192).

It is not an unprimeable number, because it can be changed into a prime (1645955713) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3042162 + ... + 3042702.

Almost surely, 2^1645955712 is an apocalyptic number.

1645955712 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1645955712, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2515422000).

1645955712 is an abundant number, since it is smaller than the sum of its proper divisors (3384888288).

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

1645955712 is a wasteful number, since it uses less digits than its factorization.

1645955712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 719 (or 704 counting only the distinct ones).

The product of its digits is 378000, while the sum is 45.

The square root of 1645955712 is about 40570.3797369460. The cubic root of 1645955712 is about 1180.6995067274.

The spelling of 1645955712 in words is "one billion, six hundred forty-five million, nine hundred fifty-five thousand, seven hundred twelve".