1645330116621 has 16 divisors (see below), whose sum is σ = 2289842904960. Its totient is φ = 1048880701440.

The previous prime is 1645330116557. The next prime is 1645330116649. The reversal of 1645330116621 is 1266110335461.

It is not a de Polignac number, because 1645330116621 - 2⁶ = 1645330116557 is a prime.

It is a super-2 number, since 2×1645330116621² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1645330116621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1645330116671) 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 15 ways as a sum of consecutive naturals, for example, 3351760 + ... + 3811161.

It is an arithmetic number, because the mean of its divisors is an integer number (143115181560).

Almost surely, 2^{1645330116621} is an apocalyptic number.

It is an amenable number.

1645330116621 is a deficient number, since it is larger than the sum of its proper divisors (644512788339).

1645330116621 is a wasteful number, since it uses less digits than its factorization.

1645330116621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7166276.

The product of its (nonzero) digits is 77760, while the sum is 39.

The spelling of 1645330116621 in words is "one trillion, six hundred forty-five billion, three hundred thirty million, one hundred sixteen thousand, six hundred twenty-one".