1645654620225 has 48 divisors (see below), whose sum is σ = 3392185743360. Its totient is φ = 683908411200.

The previous prime is 1645654620223. The next prime is 1645654620229. The reversal of 1645654620225 is 5220264565461.

It is not a de Polignac number, because 1645654620225 - 2¹ = 1645654620223 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1645654620223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 142475145 + ... + 142486694.

It is an arithmetic number, because the mean of its divisors is an integer number (70670536320).

Almost surely, 2^{1645654620225} is an apocalyptic number.

1645654620225 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1645654620225 is an abundant number, since it is smaller than the sum of its proper divisors (1746531123135).

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

1645654620225 is a wasteful number, since it uses less digits than its factorization.

1645654620225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 284961870 (or 284961865 counting only the distinct ones).

The product of its (nonzero) digits is 3456000, while the sum is 48.

The spelling of 1645654620225 in words is "one trillion, six hundred forty-five billion, six hundred fifty-four million, six hundred twenty thousand, two hundred twenty-five".