1643621606417 has 8 divisors (see below), whose sum is σ = 1878440043456. Its totient is φ = 1408807006992.

The previous prime is 1643621606413. The next prime is 1643621606447. The reversal of 1643621606417 is 7146061263461.

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

It is not a de Polignac number, because 1643621606417 - 2² = 1643621606413 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1643621606413) 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, 25823 + ... + 1813259.

It is an arithmetic number, because the mean of its divisors is an integer number (234805005432).

Almost surely, 2^{1643621606417} is an apocalyptic number.

It is an amenable number.

1643621606417 is a deficient number, since it is larger than the sum of its proper divisors (234818437039).

1643621606417 is a wasteful number, since it uses less digits than its factorization.

1643621606417 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1918807.

The product of its (nonzero) digits is 870912, while the sum is 47.

Adding to 1643621606417 its reverse (7146061263461), we get a palindrome (8789682869878).

The spelling of 1643621606417 in words is "one trillion, six hundred forty-three billion, six hundred twenty-one million, six hundred six thousand, four hundred seventeen".