1625209645 has 8 divisors (see below), whose sum is σ = 2002961304. Its totient is φ = 1265027904.

The previous prime is 1625209613. The next prime is 1625209697. The reversal of 1625209645 is 5469025261.

It can be written as a sum of positive squares in 4 ways, for example, as 131928196 + 1493281449 = 11486^2 + 38643^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1625209645 - 2⁵ = 1625209613 is a prime.

It is a super-3 number, since 3×1625209645³ (a number of 29 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1625209598 and 1625209607.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4392274 + ... + 4392643.

It is an arithmetic number, because the mean of its divisors is an integer number (250370163).

Almost surely, 2^1625209645 is an apocalyptic number.

It is an amenable number.

1625209645 is a deficient number, since it is larger than the sum of its proper divisors (377751659).

1625209645 is an equidigital number, since it uses as much as digits as its factorization.

1625209645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8784959.

The product of its (nonzero) digits is 129600, while the sum is 40.

The square root of 1625209645 is about 40313.8889838229. Note that the first 3 decimals coincide. The cubic root of 1625209645 is about 1175.7179002053.

The spelling of 1625209645 in words is "one billion, six hundred twenty-five million, two hundred nine thousand, six hundred forty-five".