1647220007641 has 8 divisors (see below), whose sum is σ = 1774022474504. Its totient is φ = 1520430860160.

The previous prime is 1647220007633. The next prime is 1647220007659. The reversal of 1647220007641 is 1467000227461.

It can be written as a sum of positive squares in 4 ways, for example, as 65086214400 + 1582133793241 = 255120^2 + 1257829^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1647220007641 - 2³ = 1647220007633 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1647220007594 and 1647220007603.

It is not an unprimeable number, because it can be changed into a prime (1647220007141) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3072246 + ... + 3568351.

It is an arithmetic number, because the mean of its divisors is an integer number (221752809313).

Almost surely, 2^{1647220007641} is an apocalyptic number.

It is an amenable number.

1647220007641 is a deficient number, since it is larger than the sum of its proper divisors (126802466863).

1647220007641 is a wasteful number, since it uses less digits than its factorization.

1647220007641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6659691.

The product of its (nonzero) digits is 112896, while the sum is 40.

The spelling of 1647220007641 in words is "one trillion, six hundred forty-seven billion, two hundred twenty million, seven thousand, six hundred forty-one".