1626650625421 has 2 divisors, whose sum is σ = 1626650625422. Its totient is φ = 1626650625420.

The previous prime is 1626650625403. The next prime is 1626650625449. The reversal of 1626650625421 is 1245260566261.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1626617101321 + 33524100 = 1275389^2 + 5790^2 .

It is a cyclic number.

It is not a de Polignac number, because 1626650625421 - 2¹⁹ = 1626650101133 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1626650625401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 813325312710 + 813325312711.

It is an arithmetic number, because the mean of its divisors is an integer number (813325312711).

Almost surely, 2^{1626650625421} is an apocalyptic number.

It is an amenable number.

1626650625421 is a deficient number, since it is larger than the sum of its proper divisors (1).

1626650625421 is an equidigital number, since it uses as much as digits as its factorization.

1626650625421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1036800, while the sum is 46.

The spelling of 1626650625421 in words is "one trillion, six hundred twenty-six billion, six hundred fifty million, six hundred twenty-five thousand, four hundred twenty-one".