1625001665489 has 2 divisors, whose sum is σ = 1625001665490. Its totient is φ = 1625001665488.

The previous prime is 1625001665389. The next prime is 1625001665509. The reversal of 1625001665489 is 9845661005261.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1386310791889 + 238690873600 = 1177417^2 + 488560^2 .

It is a cyclic number.

It is not a de Polignac number, because 1625001665489 - 2²⁰ = 1625000616913 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1625001665489.

It is not a weakly prime, because it can be changed into another prime (1625001665389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 812500832744 + 812500832745.

It is an arithmetic number, because the mean of its divisors is an integer number (812500832745).

Almost surely, 2^{1625001665489} is an apocalyptic number.

It is an amenable number.

1625001665489 is a deficient number, since it is larger than the sum of its proper divisors (1).

1625001665489 is an equidigital number, since it uses as much as digits as its factorization.

1625001665489 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3110400, while the sum is 53.

The spelling of 1625001665489 in words is "one trillion, six hundred twenty-five billion, one million, six hundred sixty-five thousand, four hundred eighty-nine".