1661623025 has 12 divisors (see below), whose sum is σ = 2063223600. Its totient is φ = 1327484880.

The previous prime is 1661623001. The next prime is 1661623039. The reversal of 1661623025 is 5203261661.

1661623025 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 1661623025 - 2²⁰ = 1660574449 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1661622982 and 1661623000.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 26495 + ... + 63444.

It is an arithmetic number, because the mean of its divisors is an integer number (171935300).

Almost surely, 2^1661623025 is an apocalyptic number.

It is an amenable number.

1661623025 is a deficient number, since it is larger than the sum of its proper divisors (401600575).

1661623025 is an equidigital number, since it uses as much as digits as its factorization.

1661623025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90688 (or 90683 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 32.

The square root of 1661623025 is about 40763.0104997165. The cubic root of 1661623025 is about 1184.4339133608.

Adding to 1661623025 its reverse (5203261661), we get a palindrome (6864884686).

The spelling of 1661623025 in words is "one billion, six hundred sixty-one million, six hundred twenty-three thousand, twenty-five".