1645797925 has 12 divisors (see below), whose sum is σ = 2095947076. Its totient is φ = 1281052800.

The previous prime is 1645797911. The next prime is 1645797941. The reversal of 1645797925 is 5297975461.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 13557124 + 1632240801 = 3682^2 + 40401^2 .

It is not a de Polignac number, because 1645797925 - 2⁵ = 1645797893 is a prime.

It is a Duffinian number.

It is a congruent number.

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, 888696 + ... + 890545.

Almost surely, 2^1645797925 is an apocalyptic number.

It is an amenable number.

1645797925 is a deficient number, since it is larger than the sum of its proper divisors (450149151).

1645797925 is a wasteful number, since it uses less digits than its factorization.

1645797925 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1779288 (or 1779283 counting only the distinct ones).

The product of its digits is 4762800, while the sum is 55.

The square root of 1645797925 is about 40568.4350819698. The cubic root of 1645797925 is about 1180.6617768773.

The spelling of 1645797925 in words is "one billion, six hundred forty-five million, seven hundred ninety-seven thousand, nine hundred twenty-five".