1623664011617 has 2 divisors, whose sum is σ = 1623664011618. Its totient is φ = 1623664011616.

The previous prime is 1623664011589. The next prime is 1623664011623. The reversal of 1623664011617 is 7161104663261.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1044434944576 + 579229067041 = 1021976^2 + 761071^2 .

It is a cyclic number.

It is not a de Polignac number, because 1623664011617 - 2³⁰ = 1622590269793 is a prime.

It is not a weakly prime, because it can be changed into another prime (1623664011667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 811832005808 + 811832005809.

It is an arithmetic number, because the mean of its divisors is an integer number (811832005809).

Almost surely, 2^{1623664011617} is an apocalyptic number.

It is an amenable number.

1623664011617 is a deficient number, since it is larger than the sum of its proper divisors (1).

1623664011617 is an equidigital number, since it uses as much as digits as its factorization.

1623664011617 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 217728, while the sum is 44.

Adding to 1623664011617 its reverse (7161104663261), we get a palindrome (8784768674878).

The spelling of 1623664011617 in words is "one trillion, six hundred twenty-three billion, six hundred sixty-four million, eleven thousand, six hundred seventeen".