1623005621609 has 2 divisors, whose sum is σ = 1623005621610. Its totient is φ = 1623005621608.

The previous prime is 1623005621593. The next prime is 1623005621651. The reversal of 1623005621609 is 9061265003261.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1070552355625 + 552453265984 = 1034675^2 + 743272^2 .

It is a cyclic number.

It is not a de Polignac number, because 1623005621609 - 2⁴ = 1623005621593 is a prime.

It is not a weakly prime, because it can be changed into another prime (1623005621659) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 811502810804 + 811502810805.

It is an arithmetic number, because the mean of its divisors is an integer number (811502810805).

Almost surely, 2^{1623005621609} is an apocalyptic number.

It is an amenable number.

1623005621609 is a deficient number, since it is larger than the sum of its proper divisors (1).

1623005621609 is an equidigital number, since it uses as much as digits as its factorization.

1623005621609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 116640, while the sum is 41.

The spelling of 1623005621609 in words is "one trillion, six hundred twenty-three billion, five million, six hundred twenty-one thousand, six hundred nine".