1644616025 has 12 divisors (see below), whose sum is σ = 2196195372. Its totient is φ = 1214485440.

The previous prime is 1644616009. The next prime is 1644616037. The reversal of 1644616025 is 5206164461.

It can be written as a sum of positive squares in 6 ways, for example, as 137545984 + 1507070041 = 11728^2 + 38821^2 .

It is not a de Polignac number, because 1644616025 - 2⁴ = 1644616009 is a prime.

It is a hoax number, since the sum of its digits (35) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian 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, 2529854 + ... + 2530503.

It is an arithmetic number, because the mean of its divisors is an integer number (183016281).

Almost surely, 2^1644616025 is an apocalyptic number.

It is an amenable number.

1644616025 is a deficient number, since it is larger than the sum of its proper divisors (551579347).

1644616025 is a wasteful number, since it uses less digits than its factorization.

1644616025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5060380 (or 5060375 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 35.

The square root of 1644616025 is about 40553.8657220246. The cubic root of 1644616025 is about 1180.3790855661.

The spelling of 1644616025 in words is "one billion, six hundred forty-four million, six hundred sixteen thousand, twenty-five".