1645796662272 has 880 divisors, whose sum is σ = 5896932096000. Its totient is φ = 447300403200.

The previous prime is 1645796662253. The next prime is 1645796662379. The reversal of 1645796662272 is 2722666975461.

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 79 ways as a sum of consecutive naturals, for example, 1097928979 + ... + 1097930477.

It is an arithmetic number, because the mean of its divisors is an integer number (6701059200).

Almost surely, 2^{1645796662272} is an apocalyptic number.

1645796662272 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 1645796662272, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2948466048000).

1645796662272 is an abundant number, since it is smaller than the sum of its proper divisors (4251135433728).

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

1645796662272 is a wasteful number, since it uses less digits than its factorization.

1645796662272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1630 (or 1603 counting only the distinct ones).

The product of its digits is 91445760, while the sum is 63.

The spelling of 1645796662272 in words is "one trillion, six hundred forty-five billion, seven hundred ninety-six million, six hundred sixty-two thousand, two hundred seventy-two".